14. A 8 kilogram rock is dropped off the top of a 25 meter tall building. What is the kinetic

energy of the rock right before it impacts the ground?

Answer:2000j

Explanation:

Law of conservation of energy energy State that in a close system energy can neither be created nor destroy but can be transformed from one form to another.

At the top of the height, the rock possessed only potential energy

PE=mass*g*height

PE = 8*10*25

PE=2000j

The kinetic energy at the bottom of the building will also be 2000j since energy cannot be created or destroyed, and potential energy of 2000j have been converted to kinetic energy at the bottom of the building