Question

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s The ball has energy Calucate it

Answer 1

Since the ball is in motion, the energy can be calculated by the equation for kinetic energy (KE) which is,
                                    KE = 0.5mv²
Substituting the known values from the given,
                                    KE = 0.5(2.1 kg)(30 m/s)²
Simplifying the equation will give us an answer of,
                                   KE = 945 J
Thus, the ball has an energy of 945 J. 

Answer 2

the answer is really 2.5 m/s