A 72-kg man stands on a spring scale in an elevator. Startingfrom rest, the elevator ascends, attaining its maximum speed of 1.2m/s in 0.80 s. The elevator travels with this constant speed for5.0 s, undergoes a uniform negative acceleration for 1.5s, and then comes to rest. What does the spring scale register (a) before the elevator starts to Move?
(b) during the first 0.80 s ofthe elevator's ascent?
(c) while the elevator is traveling atconstant speed?
(d) during the elevator's negativeacceleration?