Question

A 10 kg rock is suspended 320 m above the ground.
Calculate the potential energy of the rock before it is released.
P.E. =

1.6 x 104 J
3.1 x 104 J
3.1 x 107 J
1.0 x 107 J

Answer 1

Potential energy is energy which results from position or configuration. It is the energy stored in an object not moving. It is calculated by:

PE = mgh

where m is the mass, g is the gravitational acceleratin and h is the height.

PE = 10 ( 9.8) (320) = 31360 J = 3.1 x 104 J --------> OPTION 2

Answer 2

Answer: Calculate the potential energy of the rock before it is released.

P.E. = 3.1 x 10^4 J

1.6 x 104 J

3.1 x 104 J

3.1 x 107 J

1.0 x 107 J

Explanation: