A 4kg rock is dropped from 5 m. There is no friction. A) What kind of energy does it have before?

B) What kind of energy does it have after?

C) Does the energy before equal to the energy after?

D) Was work done?

E) Put the above into The Law of Conservation of Energy.

F) Solve for the speed of the object that's at the bottom. (right after the rock drops)