A rock falls from a high cliff. When it reaches the ground below it is moving at 45 m/s. For how much time was the rock falling? (Ignore air resistance.)

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.

Iwould have to say sorry i can't elaborate more. hope this though!