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August 21, 2014

Homework Help: physics

Posted by Amelia on Thursday, May 10, 2012 at 11:51am.

A 17-kg rock is on the edge of a 103-m cliff.
(a) What potential energy does the rock possess relative to the base of the cliff?
1 . J
(b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground?
2 . J
(c) What speed does the rock have as it strikes the ground?
3 44.7m/s

- i got the 3 answer, need help with the other 2 setups!

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