1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kitty [74]
3 years ago
13

A ball is thrown upwards from the edge of a cliff. The horizontal velocity and vertical velocity are both 20m/s the distance fro

m the ball to the bottom of the cliff is 100m/s. How high does the ball go? How long does it take the ball to hit the ground, from the time it leaves the child's hand?
Physics
1 answer:
german3 years ago
3 0

Answer:

20m

6.9s

Explanation:

The vertical velocity of the ball is 20m/s. We can calculate the kinetic energy which gets transferred to potential energy once it gets to the top.

E_k = E_p

0.5mv^2 = mgh

h = \frac{0.5v^2}{g}

we can subtitute v = 20m/s and g = 10m/s2

h = \frac{0.5*20^2}{10} = 20 m

So the ball could go 20m high from the child hand, or 120m fro the bottom of the cliff.

The time it takes for the ball to travels to the top is the time it takes for it to decelerate from 20m/s to 0m/s with gravitational deceleration g = 10m/s2

t = v / g = 20 / 10 = 2s

Then the ball will start accelerating down ward with a constant acceleration of g = 10m/s. In order to cover distance d of 120m from the top to the bottom of the cliff

d = \frac{gt_2^2}{2}

t^2 = \frac{2d}{g} = \frac{2*120}{10} = 24

t = \sqrt{24} = 4.9s

So the total time it takes is 4.9 + 2 = 6.9s

You might be interested in
What will be the change in velocity of a 850kg car if a force of 50,000 N
yKpoI14uk [10]

Answer:

29.412m/s

Explanation:

F=ma where F= force, m= mass, and a=acceleration

we also know that,

a = Δv / t where Δv = change in velocity and t = time

thus F = m ( Δv / t)

50000=850(\frac{v}{0.5})

\frac{50000}{1700}= Δv

29.412m/s=Δv

8 0
3 years ago
The force of gravity acting<br> on a child's mass on earth is 490 newtons. what's the child's mass?
UNO [17]
F = m • a

What we know:
- Gravity: 9.8 m/s
- Force: 490 N

Equation derived:
m = F/a
m = 490/9.8
= 50 kg
6 0
3 years ago
Read 2 more answers
If a 2 kg ball has 120 J of PE, then how high off the ground is it?
Yakvenalex [24]
I think 6.1m i’m not sure sorry if i’m wrong
7 0
3 years ago
Select the correct answer. A golfer hits a golf ball with a velocity of 36.0 meters/second at an angle of28.0°. If the hang time
lions [1.4K]
Its 83 im pretty sure :)
5 0
3 years ago
I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125g. What must the volume be to have a density
Stells [14]

Answer:

250 mL

Explanation:

Density equation:

Density = \frac{mass}{volume}

Variables:

D = density

m = mass

V = volume

Solve:

M = 125 g

D = 0.500 g/mL

V = ?

0.500 g/mL = \frac{125 g}{V}

V = 250 mL

3 0
3 years ago
Other questions:
  • What determines how much induced current will flow through a conductor?
    14·1 answer
  • What is the difference in the speed of sound on a warm day versus on a cold day?
    9·1 answer
  • The figure shows four forces exerted on a moving box, moving at a constant speed. If the box continues to move with the same spe
    12·2 answers
  • Which one of the following terms is used to describe the bending of waves and subsequent spreading around obstacles or the edges
    8·1 answer
  • Facts or naw:<br> common sense is so rare that it should be a superpower
    14·2 answers
  • 2. Which of the following is an example of work being done on an object? A prism scatters ultraviolet light into visible light.
    10·2 answers
  • two friends are talking to another person across the building the other person can hear them but not see them why is this?
    5·1 answer
  • A motobike's tire rotates with a constant angular speed of 62.8 rad/s. The radius of a tire is 30cm. Assuming that no slipping o
    12·1 answer
  • Answer the question based on this waveform.
    8·1 answer
  • If a girl does 1,350 Joules of work to pedal her bike using a force of 75 N, how far did she ride her bike?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!