**Q2: **

A cat’s crinkle ball toy of mass
15 g
is thrown straight up with an initial
speed of
3.0 m/s.
Assume, in this problem, that air drag is negligible.

What is the kinetic energy of the ball as it leaves the hand?

How much work is done by the gravitational force during the ball’s rise to its peak?

What is the change in the gravitational potential energy of the ball during the rise to its peak?

If the gravitational potential energy is taken to be zero at the point where
the ball leaves the hand, what is the gravitational potential energy when it reaches the maximum height?

If the gravitational potential energy is taken to be zero at the maximum height
the ball reaches, what would the gravitational potential energy be when it leaves the hand?

What is the maximum height the ball reaches?