A tennis ball is beaten downward with an initial speed of 5 m/s.
How fast, in m/s, is the ball falling after 3 seconds (neglect air
friction, so g = 9.8 m/s2)?

a 34.4
b 34.4
C 9.8
d 9.8
e 5

Answers

Answer 1

Answer:

34.4m/s

Explanation:

Step one:

given data

initial speed u= 5m/s

time t= 3seconds

acceleration due to gravity g= 9.8m/s^2

Required:

the final velocity v

Step two:

applying the first equation of motion

v=u+gt-----------we used + because the ball is falling with gravity

v=5+9.8*3

v=5+29.4

v=34.4

The final velocity is 34.4m/s

Answer 2

Answer:

-34.4

Explanation:

the person above had the right approach but it would be negative as it is in a downwards motion


Related Questions

The total mechanical energy of a system is 950 J and the gravitational potential energy is 350 J. What is the kinetic energy?​

Answers

Answer:

The kinetic energy is 600 J

Explanation:

Mechanical Energy

The principle of the conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative forces.

The mechanical energy is defined as the sum of the potential plus kinetic energies:

E = U + K

Where E is the total mechanical energy, U is the gravitational potential energy and K is the kinetic energy.

Solving for K:

K = E - U

The system described has a total mechanical energy of E=950 J and gravitational potential energy of U=350 J, thus:

K = 950 J - 350 J

K = 600 J

The kinetic energy is 600 J

1. Explain how this picture is an example of kinetic energy.

2. What factors affect the energy of the ball?

3. What change could be made to give the ball more energy?

Answers

Answer:

1. when in motion(moving) it is Kinetic energy

2. it is kinetic when moving and potential when at rest

3. by constantly kicking or moving the ball

Explanation:

At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three different directions. As a result, three forces act on the ball, F1, F2, and F3. The magnitudes of F1 and F2 are F1=50.0N and F2=90.0N. F1 acts under the angle of 60degrees with respect to the x axis and F2 is directed along the x-axis. Find the magnitude and direction of F3 such that the resultant force acting on the ball is zero.

Answers

Answer:

F₃ = 122.88 N

θ₃ = 20.63°

Explanation:

First we find the components of F₁:

For x-component:

F₁ₓ = F₁ Cos θ₁

F₁ₓ = (50 N) Cos 60°

F₁ₓ = 25 N

For y-component:

F₁y = F₁ Sin θ₁

F₁y = (50 N) Sin 60°

F₁y = 43.3 N

Now, for F₂. As, F₂ acts along x-axis. Therefore, its y-component will be zero and its x-xomponent will be equal to the magnitude of force itself:

F₂ₓ = F₂ = 90 N

F₂y = 0 N

Now, for the resultant force on ball to be zero, the sum of x-components of the forces and the sum of the y-component of the forces must also be equal to zero:

F₁ₓ + F₂ₓ + F₃ₓ = 0 N

25 N + 90 N + F₃ₓ = 0 N

F₃ₓ = - 115 N

for y-components:

F₁y + F₂y + F₃y = 0 N

43.3 N + 0 N + F₃y = 0 N

F₃y = - 43.3 N

Now, the magnitude of F₃ can be found as:

F₃ = √F₃ₓ² + F₃y²

F₃ = √[(- 115 N)² + (- 43.3 N)²]

F₃ = 122.88 N

and the direction is given as:

θ₃ = tan⁻¹(F₃y/F₃ₓ) = tan⁻¹(-43.3 N/-115 N)

θ₃ = 20.63°

A cow standing atop a building in Times Square recalled a funny joke and began to laugh. The uncontrollable laughter caused the cow to fall over the side of the building. He fell for a time period of 3.5 s and landed in a bed of bushes. How fast was the cow moo-ving when he reached the bushes?

Which equation should be used to solve the problem?

Answers

Answer:

Vf = 34.3 m/s

1st equation of motion was used to solve.

Explanation:

In order to find the final speed of the cow, when it hits the bushes, we can use first equation of motion:

Vf = Vi + gt

where,

Vf = Final Velocity of Cow = ?

Vi = Initial Velocity of Cow = 0 m/s

g = acceleration due to gravity = 9.8 m/s²

t = time taken = 3.5 s

Therefore,

Vf = 0 m/s + (9.8 m/s²)(3.5 s)

Vf = 34.3 m/s

1st equation of motion was used to solve.

The force of 5N south acts concurrently with force of 5N 30 degrees South of East

A. Draw the diagram - TAIL to TAIL

B. Label both vectors (see page one for example)

C. Draw and LABEL the resultant and equilibrant

D.Find the magnitude and direction of the resultant and equilibrant


(scale: 1cm = 1N)

Answers

Answer:

The magnitude and direction of the resultant is 8.66 N and [tex]60^{\circ}[/tex] south of East.

The magnitude and direction the equilibrant is 8.66 N and [tex]60^{\circ}[/tex] North of West respectively.

Explanation:

Let

[tex]P=5\ \text{N}\ \text{south}[/tex]

[tex]Q=5\ \text{N}\ 30^{\circ}\ \text{south of east}[/tex]

[tex]\theta[/tex] = Angle between P and Q = [tex]60^{\circ}[/tex]

Magnitude of resultant

[tex]R=\sqrt{P^2+Q^2+2PQ\cos\theta}\\\Rightarrow R=\sqrt{5^2+5^2+2\times 5\times 5\cos60^{\circ}}\\\Rightarrow R=8.66\ \text{N}[/tex]

Direction is given by

[tex]\theta=\tan^{-1}\dfrac{Q\sin\theta}{P+Q\sin\theta}\\\Rightarrow \theta=\tan^{-1}\dfrac{5\sin60^{\circ}}{5+5\sin60^{\circ}}\\\Rightarrow \theta=30^{\circ}[/tex]

The magnitude and direction of the resultant is 8.66 N and [tex]30^{\circ}+30^{\circ}=60^{\circ}[/tex] south of East.

The magnitude and direction the equilibrant is 8.66 N and [tex]60^{\circ}[/tex] North of West.

A bulldozer pushes on a boulder with a force of 600 N. It accelerates at 3 m/s. Find mass.​

Answers

Answer:

Formula for mass: m=f/a

m=600/3

The mass is 200.

Explanation:

Hope this helps!

how can we calculate acceleration in motion which is not uniform or uniformly accelerated​ please help tell me another formula to calculate acceleration

Answers

Answer:

These are some of the ones I found or know of.

Explanation:

F=ma

A= v-u/t

A= v^2/r

10. Scientists created models that show a rocky asteroid crashing into a moon (less mass) a
planet (more mass). In both crashes, the asteroid was the same mass. Scientists want to kno
happened to the asteroid. Use the information in the diagram to answer.
In which crash did the asteroid experience a stronger force? How do you know?
a
Crash 2; the force on the planet was stronger in this crash, so the force on the astero
also stronger.
There was no force on the asteroid. Only the moon and planet experienced a force in

Answers

Answer:

The diagram doesn’t tell you anything about the force on the asteroid. It only gives information about the force on the planet and the moon.

Explanation:

if the net force of 15 N is exerted on an encyclopedia to cause it to accelerate at a rate of 5 m/s2. what is the mass of the encyclopedia

Answers

Answer:

3 kg

Explanation:

F = ma

(15) = m(5)

m = 3 kg

Can two spheres of different diameters and different
masses have the same moment of inertia?

Answers

Answer:

NO

Explanation:

I=mr^2 this means moment inertia depends upon mass and square of radius or distance.

Balanced Forces acting on an object will not change the object's motion. Unbalanced Forces acting on an object will change the change the object's motion.

Answers

Answer:

TRUE

Explanation:

The answer is true.

Balance forces acting on a body will not change the motion of the body because the body experiences no net resultant force in one direction. When any body experiences equal forces with opposite directions, the net force or the resultant force experience by the body is zero.

In case of an unbalanced forces, there is a net force acting in one direction and so it causes the body to change in its state of motion in the direction of the net force.

plz help i really need this

Answers

Answer:

The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.

Explanation:

Answer:

The Group Number of the elements.

Explanation:

If Marie knew the group number of the elements, then she could determine the amount of valence electrons each element has and their reactivity rate. For example, if one box tells her that an element is located in group 18, then she could determine that the element is not very reactive. This is because elements in group 18 have 8 valence electrons, which makes them stable/unreactive.

Hope this helps!

Refinery EM can produce 22 gallons of gasoline or 18 gallons of flight fuel per barrel of crude oil. Refinery CG can produce 18 gallons of gasoline or 16 gallons of flight fuel per barrel of crude oil. Does OUTPUT vary or does INPUT vary in this problem?

Answers

Answer:

Output varies

Explanation:

Here the outputs of gallons of gasoline and flight fuel is mentioned of two refineries namely Refinery EM and Refinery CG. The output has been mentioned with respect to one barrel of crude oil. So, one barrel of crude is used by both the refineries.

So, here the output (gallons of gasoline and flight fuel) varies while the input (one barrel of crude oil) remains constant.

When does an object reach its terminal velocity?

Answers

Answer: Terminal velocity is achieved, therefore, when the speed of a moving object is no longer increasing or decreasing; the object's acceleration (or deceleration) is zero.

Explanation:.

Answer: Terminal velocity is achieved, therefore, when the speed of a moving object is no longer increasing or decreasing; the object's acceleration (or deceleration) is zero.

As others have said, 8 seconds to get to 90% of terminal velocity. But if you're falling from outer space, you could reach speeds much higher than terminal velocity, and slow down when you reach the atmosphere. If coming in from a long distance, you'll burn up like a meteorite.

Explanation:

Use the following v-t graph to answer the next questions
5
B
Velocity )
neters/second(s)
4
A
3
2
1
Time (1)
0
1
2
3
4
5
2
8
10
11
12
13
1015
16
second(s)
.1
D
-2
C С
3
5

Answers

Answer:

mag aral ka bubu

Explanation:

ang tanga mu hahahahhaha luko nandyan lang naman yan hahahhahahahahahahhahahahahahahahhahahahahahaahahahahahahahhahahahahahahahahahahahahaahhahahaahahhaahha09561782

Liam wants to determine if foam is a good insulator. He decides to connect wires to two ends of a battery and then connect one wire to each end of a foam cup. Which inquiry skill is Liam using?

Answers

Answer: liain is using lucid mode

Explanation:btw im from canida so sorry if its wrong

You are a medical student who has been instructed to make a transverse Cut through the abdomen.Calling through the abdomen in which direction will accomplish your goal

Answers

cutting across the middle of the abdomen from left to right would be a transverse cut

help me pleaseeeee ​

Answers

How often the particles of a medium vibrate

Answer:

Explanation:

Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion...............

A complex arrangement of pulleys forms what is called the block in a block and tackle. The rope used to lift the pulleys and the load is the tackle. A block and tackle is used to lift a truck engine, which has a weight and output force of nearly 8000 N. The input force required to lift this weight using the block and tackle is 400N. What is the mechanical advantage of the block and tackle?

Answers

Answer:

Mechanical advantage = 20

Explanation:

Given:

Output force = 8,000 N

Input force = 400 N

Find:

Mechanical advantage

Computation:

Mechanical advantage = Output force / Input force

Mechanical advantage = 8,000 / 400

Mechanical advantage = 20

What made "Lunar Orbit Rendezvous" such an attractive method to get to the Moon that it was selected by NASA in July, 1962

Answers

Answer:

I don't know the answer

if a gas produced, most likely a ______ reaction took place ​

Answers

Answer:

if a gas produced, most likely a chemical reaction took place ​

Explanation:

Answer:

if a gas produced, most likely a Chemical reaction took place

Explanation:

hope this helps and have a good day <3


5.
Assertion (A): Both stretched spring and compressed spring have potential energy
Reason (R): Work is done against the restoring force in each case.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R true and R is not the correct explanation of A
c) A is true but Ris false
d) A is false but R is true​

Answers

Answer:

A. Both A and R are true and R is the correct explanation of A

why black coats are preferable in winter than others​

Answers

Answer:

the color black draws in heat as lighter colors reflect heat

Explanation:

Black absorbs and draws more heat than lighter colors:)

1. The unit of power is called a derived unit, why?

Answers

Answer:

Because its depends upon fundamental units and formed by combination of two or more fundamental units.

A skier rides horizontally off of a 200 meter high cliff. If he lands 25 meters away from the base of the cliff, how fast was he skiing as he went off the edge?

A. 0.91 m/s
B. 2.91 m/s
C. 3.91 m/s
D. 25.91 m/s

Answers

Answer:

the answers, the correct one is C,   v₀ₓ = vₓ = 3.91 m / s

Explanation:

This is a projectile launching exercise, in this case they indicate that when leaving the cliff it goes horizontally, therefore the initial vertical speed is zero, let's find the time to reach the base

        y = y₀ + [tex]v_{oy}[/tex] t - ½ g t²

at the base the height is zero (y = 0 m)

        0 = y₀ + 0 - ½ g t²

         t = √ (2y₀ / g)

         

we calculate

        t = √ (2 200 / 9.8)

        t = 6.389 s

with this time we calculate the horizontal speed

        v₀ₓ = x / t

        v₀ₓx = 25 / 6,389

        v₀ₓ = vₓ = 3.91 m / s

When checking the answers, the correct one is C

Susie Small finds she weighs 300 N.
Calculate her mass.

Answers

Answer:

30Kg

Explanation:

Weight = mass x gravitational field strength

300 = mass x 10

mass = 30kg

gravitational field strength is 9.8 on earth but normally we take it to be 10 for easy reference and calculations

The mass will be "30 kg". A further solution is provided below.

According to the question,

Weight,

300 N

We know that,

Gravitational field strength,

10

The mass will be:

→ [tex]Weight = Mass\times Gravitational \ field \ strength[/tex]

or,

→ [tex]Mass = \frac{Weight}{Gravitational \ field \ strength}[/tex]

By putting the values, we get

→           [tex]= \frac{300}{10}[/tex]    

→           [tex]= 30 \ kg[/tex]

Thus the above solution is right.

Learn more about mass here:

https://brainly.com/question/20353971

Help plz will give brainliest

Answers

Answer:

The forces acting on the root beer is the ice cream. This means that the 'air' in the ice cream keeps it at the top of the root beer enabling it to float right at the top.

In a container of negligible mass, 0.0400 kg of steam at 100∘C100 ∘ C and atmospheric pressure is added to 0.200 kg of water at 50.0∘C50.0 ∘ C.
(a) If no heat is lost to the surroundings, what is the final temperature of the system?
(b) At the final temperature, how many kilograms are there of steam and how many of liquid water?

Answers

A - 100 C°
B - 0.0214 kg and 0.219 kg

Hope this helped out! Have a nice day :)

If no heat is lost to the surroundings, the final temperature of the system is 100 C°,  At the final temperature, 0.0214 kg and 0.219 kg kilograms are there of steam and how many of liquid water

What is heat ?

heat can be defined as the form of energy that is spontaneously transferred from one object to another object as the differences in temperatures is otherwise called as heat transfer.

The Heat transfer occurs  upto the  equilibrium point of an object has been reached.

Internal Energy is the total amount of energy of all the molecules of a body is the internal energy within the object.

Specific Heat or heat capacity, is   the amount of energy required to produce a unit change in its temperature.

For more details  heat,  visit

brainly.com/question/13411214

#SPJ5

PLSSSS HELPPP What effects do mutations have? Check all that apply.

A) could change protein shape
B)never change protein shape
C)might be neutral
D)always change the way a trait is observed
E)might be harmful
F)might be beneficial

Answers

Answer:

E, F, A, C

Explanation:

They cannot change the way a trait is observed

Mutations could change protein shape(A), could cause genetic disorders and harm you(E), could actually be beneficial and cause adaptations to your environment(F), or they could be neutral in which no changes are observantly notable(C).

Hope this helps

(NEED HELP ASAP)
In a lab investigation one group of students (group a) measures the speed of a 0.1 toy car to be 2.5 m/s at the bottom of a ramp another group of students (group b) measures the speed of the car to be 3 m/s at the bottom of the ramp the cars starting position at the top of the ramp is 1 m high.

a. what is the potential energy of the car at the beginning of the experiment before it's speed is measured?

b. Calculate the kinetic energy of the car for group a.

C. Calculate the kinetic energy for the car for group b.

Answers

Answer:

a = 0.98J

Explanation:

PE = mgh

PE = 0.1 x 9.8 x 1

PE = 0.98J

(a) The potential energy of the car at the beginning of the experiment is 9.8(m) J.

(b) The kinetic energy of the car for group a is 3.125(m) J.

(c) The kinetic energy of the car for group b is 4.5(m) J.

Potential energy of the car at the beginning of the experiment

The potential energy of the car is calculated as follows;

P.E = mgh

where;

m is mass of the carg is accleration due to gravityh is height of the car

P.E = m x 9.8 x 1

P.E = 9.8(m) J

Kinetic energy of the car for group a

K.E = ¹/₂mv²

K.E = ¹/₂ x m x (2.5)²

K.E = 3.125(m) J

Kinetic energy of the car for group b

K.E = ¹/₂mv²

K.E = ¹/₂ x m x (3)²

K.E = 4.5(m) J

Learn more about kinetic energy here:https://brainly.com/question/25959744

#SPJ2

Other Questions
Read the passage.The countys "Technology 2020 initiative proposes that the school district provide laptops for every student in grades 9-12. This would cost millions of dollars in planning, implementation, and maintenance. Taxpayers may wonder whether this expensive proposal is a practical solution. It is better than practical, and it is an innovative approach with the potential to enhance students educational experience.Which phrase best reveals the authors viewpoint?provide laptopsmillions of dollarsexpensive proposalinnovative approach 1-2. Because Helen Keller could not hear or see, the keenness of her other senses(e)d by use. It is said that she couldwho was in a room simplyby using her sense of smell.was34. Arobot that collects and delivers mail throughout the office buildings itself with electric eyes.5-6. In fables, animals often illustrate human _$. In the story of the racebetween the tortoise and the hare, the tortoise is meant to the humanqualities of being slow but steady. Despite competing against a muchspeedier antagonist, be perseveres and defeats the overly confident hare. At the beginning of a baking session, there were 2.26 kilograms of flour in a bag. By the end of the baking session, there were 0.98 kilograms of flour in the bag. What is the percent decrease in the amount of flou can someone please help and explain Why does rain forest provide an unusual variety of food for animals? Plz help I am timed A system of government in which all decisions are made by a small, elite group is called a(n)A democracyB. republicC. oligarchyD. theocracy A small deck of 5 cards consists of 3 red Jards and 2 green cards.Draw 7 times with replacement.Find the probability that a red card is drawn exactly 3 times. 3. Why did the landforms and soil of New Englandcause many to turn to the Atlantic Ocean for aliving? What is the output of the following statement? printf("%s", strspn("Cows like to moo.", "Ceiklosw ");a. 10.b. 8.c. e.d. nothing. Which of the examples below is an example of convection?A)rubbing your hands together.B)heating a fish tank.basking in the sun.D)striking a match. can someone help me think about a person or event that deserves a tribute?? Some tribes divide powers among many chiefs.Please select the best answer from the choices providedOTOF What type of sentence is this?If they place first, they might win five hundred dollars. asimple bcompound ccomplex dcompound-complex m/9 - 9 = -8. please help HURRY ASAP I NEED HELP!! Rock StressADCompare diagram B to diagram A. How is it different? "The gross primary productivity of a meadow in southeastern Kansas is found to be 38,000 kcal/m 2 . Respiration which is measured by the amount of CO 2 released is 13,500 kcal/m 2 , what is the net primary productivity for this ecosystem, in kcal/m 2 per year let a(-a -b) b(-a -b) distance between two pointsfast What is the volume of a container that is 5cm tall by 10cm long and 4cm deep What was the length of the center span of the bridge and how was that significant in the world of bridge building records at the time of construction? Find the center and radius of the equation of the circlea). x2 + y2 8x +6y + 9 = 0