Question

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. How much energy does the ball have?

Answer 1

`945 J`

Explanation:

You have just given the ball kinetic energy, which is given by the following equation:

`E_k=0.5 times m times v^2`

So the energy the ball has the moment after you hit it is:

`E_k=0.5 times 2.1 times (30)^2`
`E_k=945 J`