A student stands on a bathroom scale in an ele- vator at rest on the 64th floor of a building. The scale reads 836 N. a. As the elevator moves up, the scale reading increases to 936 N, then decreases back to 836 N. Find the acceleration of the elevator. b. As the elevator approaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator? c. Using your results from parts a and b, explain which change in velocity, starting or stopping, would take the longer time. d. What changes would you expect in the scale readings on the ride back down?