Question

A 2.80 kg mass is dropped from a height of 4.50 m. Find its potential energy when it reaches the ground.

Answer 1

Answer:

123.48J

Explanation:

Given parameters:

Mass of the ball  = 2.8kg

Height  = 4.5m

Unknown:

Potential energy  = ?

Solution:

The potential energy is the energy due to the position of a body. It is mathematically given as;

      P.E   =  mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now insert the parameters and solve;

          P.E  = 2.8 x 4.5 x 9.8  = 123.48J

Answer 2

Answer:

0

Explanation:

There is 0 PE when its on the ground