### State undergoes a uniform negative acceleration

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A 72kg man stands on a spring scale in an elevator. Startingfrom rest, the elevator acsends, 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 1.5 s, andthen comes to rest. Whatdoes the spring scale register (a)before the elevator starts to move? (b) during the first 0.80 s ofthe elevator's ascend? (c) while the elevator is traveling atconstant speed? (d) during the elevator's negativeacceleration?

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