A 49.9-g golf ball is driven from the tee with an initial speed of 48.8 m/s and rises to a height of 24.0 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 5.42 m below its highest point?

Answer 1

a) KE=original KE-PE gained
= 1/2 m *48.8^2 - mg(24)

Answer 2

I am not sure I am understanding this answer. Also if you knew how to do part b

Answer 3

How can I do part B?