Question

A 6.5 kg rock thrown down from a 120m high cliff with initial velocity 18 m/s down. Calculate

the following using the energy/work formulae only:
1.The kinetic energy at the top of the cliff
2.The total mechanical energy at the top of the cliff
3.The kinetic energy of the Rock half way down 4.the speed of the Rock half way down
5.The speed of the Rock as it hits the ground​

Answer 1

Answers and steps in the pic..hope you can u understand the calculations....