1) A person carries a 10kg rock to the top of 100m cliff and drops it from rest back to the ground.
a) How much work does gravity do on the rock during the climb?
b) How much work does gravity do on the rock during the fall?
c) How fast is the rock traveling when it hits the ground?
d) How much power was required to get the rock to the top if it took 10min to climb?
e) How much power was released during the fall?