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A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 30...

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 30 m high. When it hits the ground at the base of the cliff, the rock has a speed of 31 m/s . You may want to review (Pages 234 - 241) .A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 30 m high. When it hits the ground at the base of the cliff, the rock has a speed of 31 m/s . You may want to review (Pages 234 - 241) .

Assuming that air resistance can be ignored, find the initial speed of the rock.

Find the greatest height of the rock as measured from the base of the cliff.

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