Asked by Amelia

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!
Answered by Elena
(a) PE = m•g•h
(b) KE = PE
(c) mv²/2 = PE,
v =sqrt(2•PE/m)
Answered by amelia
can you show me how to plug each of them in?
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