Question

A 2-kg ball is held 4 m above the ground. Relative to the ground its potential energy is

Answer 1

Answer:

78.4 J

Explanation:

The gravitational potential energy of the ball (relative to the ground) is given by

$U=mgh$

where

m = 2 kg is the mass of the ball

g = 9.8 m/s^2 is the acceleration due to gravity

h = 4 m is the height of the ball above the ground

Substituting numbers into the formula, we find

$U=(2 kg)(9.8 m/s^2)(4 m)=78.4 J$