Question

What is the potential energy of a 20-kg rock perched at the top of a cliff with a height of 100 meters? O A. 2,000 J B. 19,600 J O C. 0.23 D. 200,000 J

Answer 1

The Potential Energy, is given by:

$PE=m\times g\times h$

where:

m = mass of the object (in Kg)

g = gravity

h = height (in m)

Hence:

$PE=20\times9.8\times100=19,600$

ANSWER

B. 19,600 J