(a) How many joules of kinetic energy does a 763-kg automobile traveling at a typical highway speed of 64 mi/h have? J
(b) By what factor would its kinetic energy decrease if the car traveled half as fast? KE32.0 mi/h = KE64 mi/h
(c) How fast would the car have to travel to have half as much kinetic energy as in part (a)? mi/h