Quarter Horses are typically faster than Thoroughbreds over short distances. A racehorse can run at 18 m/s and has 195,000 Joules
of kinetic energy. What is this racehorse's mass?

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.