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

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. 

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.