A2-kg ball is held 4 m above the ground. relative to the ground its potential energy is:

a) 80 j
b) 32 j
c) more than 80 j
d) 8 j
e) 6 j

a) 80 J

Explanation:

The gravitational potential energy of the ball relative to the ground is:

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 heigth of the ball above the ground

Substituting numbers into the equation,

So the correct answer is

a) 80 J

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