Physics
posted by Kristi .
A 49.9g 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?

a) KE=original KEPE gained
= 1/2 m *48.8^2  mg(24) 
I am not sure I am understanding this answer. Also if you knew how to do part b
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