A 20 kg rock is on the edge of a 100 meter cliff. What is the

potential energy of the rock and if the rock falls off the cliff,

what is its kinetic energy just before striking the ground?

a 361.4 kJ

b 1kJ. 1 kJ

C 19.6 kJ, 19.6 kJ

d 10 kl. 5.5 ku