Coach Pollard still thinks he is really fast and so he went out to sprint at the track meet. He ran at a velocity of 4 m/s. His mass is about 68 kg. About how much Kinetic Energy did Coach Pollard use before he inevitably hurt himself after the run? KE=1/2mv^2

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.