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