The kinetic energy of a body of mass m, travelling at a velocity, v, is given by ½mv². Calculate and compare the impact energies (i.e. the kinetic energies) of a small car travelling at 50 mph, and a meteoroid of mass 1g travelling at 20 km s⁻¹. (Assume the car has a mass 1000 kg and note that 50 mph is approximately 20 m s⁻¹.)