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?

Apr 11, 2018

$945 J$

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:

${E}_{k} = 0.5 \times 2.1 \times {\left(30\right)}^{2}$
${E}_{k} = 945 J$