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Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0s to brake to a stop on the

Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0s to brake to a stop on the first floor.
a. What is Zach's apparent weight before the elevator starts braking?
b. What is Zach's apparent wight while the elevator is braking?

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