Question

What is the kinetic energy of a golf ball rolling down a ruler the mass 45.93 g the height equals 31 cm and the length equals 31 cm what is the kinetic energy

Answer 1

When the ball is at height 31 cm it possess potential energy which is given as,

`U=\text{mgh}`

When the ball rolls from height along the ruler the potential energy will be converted into kinetic energy.

According to conservation of energy,

`K=U`

Plug in the known expression,

`K=\text{mgh}`

Substitute the known values,

`\begin{gathered} K=(45.93\text{ g)(}\frac{1\text{ kg}}{1000\text{ g}})(9.8m/s^2)(31\text{ cm)(}\frac{1\text{ m}}{100\text{ cm}})(\frac{1\text{ J}}{1kgm^2s^(-2)}) \\ \approx0.140\text{ J} \end{gathered}`

Thus, the kinetic energy of the ball is 0.140 J.