Question

A ball with a mass of 0.184 kg is dropped from a height of 5 m. What is the KINETIC energy in joules as the ball hits the ground? (2 decimal places)

Answer 1

Given data:

* The mass of the ball is 0.184 kg.

* The height of the ball is 5 m.

Solution:

The maximum potential energy at the maximum height is,

`U=\text{mgh}`

where m is the mass, g is the acceleration due to gravity, and h is the height of the ball,

Substituting the known values,

`\begin{gathered} U=0.184*9.8*5 \\ U=9.02\text{ J} \end{gathered}`

According to the law of conservation of energy,

The maximum kinetic energy of the ball when ball hits the ground is equal to the maximum potential energy of the ball at the maximum height.

Thus, the value of kinetic energy of the ball just hit the ground is 9.02 joules.