This question marathon is for the 2015-16 event Wind Power, which involves a written portion about energy.
First question (I'll keep this simple): Suppose that you are shooting an arrow of mass 21 g from a height of 1.5 m at the bottom of a hill 9.42 meters tall. If you fire the arrow and it lands on top of the hill,
a) How much gravitational potential energy did the arrow gain?
b) What was the initial velocity of the arrow?
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