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!

- physics -
**Elena**, Thursday, May 10, 2012 at 4:50pm
(a) PE = m•g•h

(b) KE = PE

(c) mv²/2 = PE,

v =sqrt(2•PE/m)

- physics -
**amelia**, Thursday, May 10, 2012 at 8:38pm
can you show me how to plug each of them in?

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