The height h of a falling object t seconds after it is dropped from a platform 300 feet above the ground is modeled by the function h(t) =300-16t^2. which expression could be used to determine the average rate at which the object falls during the first 3 second of its fall? a)h(3)-h(0) b)h(3/3)-h(0/3) c)h(3)/3 d)h(3)-h(0)/3