Question: A rock released from rest to fall on a small airless planet falls y = gt 2 m in t sec, g a constant. Suppose

A rock released from rest to fall on a small airless planet falls y = gt² m in t sec, g a constant. Suppose that the rock falls to the bottom of a crevasse 20 m below and reaches the bottom in 4 sec.
(a) Find the value of g.
(b) Find the average speed for the fall.
(c) With what speed did the rock hit the bottom?

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