1. Part A
Which of the ball(s) described would have the most kinetic energy?
A. 1. A basketball resting on a chair in the gym.
B. 2. A baseball was hit by a bat and now flying through the air.
c. 3. A bowling ball stationary on the floor.
D. 4. A tennis ball was hit and now rolling to a stop on the ground.

B. 2. A baseball was hit by a bat and now flying through the air.

Explanation: A baseball that is hit by a bat has a larger velocity, due to this the amount of kinetic energy is high.

C) 3,000 kg m/s

Explanation:

We can consider the horizontal velocity of the motorcycle to be zero, since it rolls off the edge of the cliff very slowly. So, we only need to find the vertical velocity at the time of the impact with the ground.

The vertical velocity of the motorcycle at time t is given by (free-fall motion):

where

is the initial vertical velocity (zero, since the motorcycle is not moving)

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

t is the time

Since the motorcycle hits the ground after t = 3 seconds, we have

And since we know its mass, m=100 kg, we can find its momentum:

and the negative sign simply means downward direction.