Question

A 2kg rock is at the edge of a cliff 20m above the surface of a lake. What is its potential energy at the top of the cliff?

Please show work!

Answer 1

392 j

Step-by-step explanation:

potential energy (PE) is equal to the mass of the object multiplied by the acceleration due to gravity multiplied by the height of the object.

PE=mgh (g=9.8 m/s/s)

PE= (2 kg)(9.8 m/s/s)(20 m)

PE= 392 j

j= joules