A baseball (mass = 145 g) is thrown straight upward with kinetic energy 7.25 J.
(a) When the ball has risen 9 m, find the work done by gravity. (Take g = 10 m/s2)
(b) Find the ball’s kinetic energy.
(c) Find the ball’s speed.
I can’t figure out the answer to B, I have the answers to A and C.