Question

1. You throw a ball from the top of a 50 m high building at 12 m/s straight upward. The ball misses the building on the way down. The mass of the ball is 2 kg.

Using energy considerations, how high does the ball go?

Using energy considerations, what is the magnitude of the velocity just as it strikes the ground?

What is the work done by the force of gravity on the ball while the ball is traveling upward?

What is the total work done by the force of gravity on the ball?

2. You throw a ball, m = 2 kg, with an initial velocity of 20 m/s at an angle of 60 degrees from the top of a 30 m cliff.

Using energy considerations, what is the magnitude of the velocity when it hits the ground?

What is the total mechanical energy in this system?

What if I change the angle to 50 degrees; does this change your answers?

Answer #1

1. You throw a ball from the top of a 50 m high building at 12
m/s straight upward. The ball misses the building on the way down.
The mass of the ball is 2 kg.
a. Using energy considerations, how high does the ball go?
b. Using energy considerations, what is the magnitude of the
velocity just as it strikes the ground?
c. What is the work done by the force of gravity on the ball
while the ball...

You throw a 2 kg ball from the top of a 30 m cliff with an
initial velocity of 25 m/s at an angle of 50 degrees.
a. using energy considerations, what is the maximum height of
the ball?
b. what is the magnitude of the velocity when it hits the
ground?
c. now, using kinematics, what is the magnitude of the velocity
when it hits the ground?

You throw a ball, m = 2kg, with an initial velocity of 20 m/s at
an angle of 60 degrees from the top of a 30 m cliff?
a. using energy considerations, what is the magnitude of the
velocity when it hits the ground?
b. what is the total mechanical energy in this system?
c. what if I change the angle to 50 degrees; does this change
your answers?

A ball, mass is 8 kg, is thrown from the top of a 30 m cliff
with a velocity of 20 m/s straight up. The ball misses the cliff on
the way down. Ignore air resistance. Use work and conservation of
energy to find the following values.
a. what is the work done by gravity while the ball is in the
air?
b. what is the maximum height of the ball?
c. what is the magnitude of the velocity just...

3. You throw a ball, m= 2kg, with an initial velocity
of 25 m/s at an angle of 50 degrees from the top of a 30m
cliff.
a. Using energy considerations, what is the maximum height of the
ball?
b. What is the magnitude of the velocity when it hits the
ground?
c. Now, using KINEMATICS, what is the magnitude of the velocity
when it hits the ground?
4. You compress a spring with k = 3000 N/m a distance...

A 2.00 kg ball is thrown straight upward from the top of a 50.0
m high building with an initial speed of 10.0 m/s. (25 points)
Given:
a. What is the total energy
at the top of the building?
b. What is the total energy
at the ground?
c. What are the potential
and kinetic energies at the ground?
d. What is its speed at the
ground?

A ball is dropped from rest from the top of a building with
height 50 meters. At the same instant, you throw a ball upward from
ground level carefully aimed to hit the falling ball. If the
initial speed of your throw is 19 m/s, then the two balls collide
at a height above the ground equal to:
a) 4.50 m b) 7.61 m c) 12.2 m d) 16.1 m e) 2.15 m

Suppose you throw a ball at 20 m/s at an angle of 60 degrees
from the horizontal from the top of a 40 m building.
a. what is the maximum height?
b. what is the velocity at the highest point?
c. what is the final velocity just as it hits the ground?
d. how far did it travel in the x direction when it hit the
ground?

A rock is thrown from the top of a building 80 m high, with a
speed of 14 m/s at an angle 25 degrees above the horizontal. When
it hits the ground, what is the magnitude of its velocity (i.e. its
speed).

A 4.1-kg ball is thrown from the top of a 4-m tall building
(point A) with a speed of 1 m/s at an angle 2 degrees above the
horizontal. If air resistance is negligible, what is the value of
the kinetic energy of the ball as it hits the ground?

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