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Zach, whose mass is 79 kgkg , is in an elevator descending at 9 m/sm/s ....

Zach, whose mass is 79 kgkg , is in an elevator descending at 9 m/sm/s . The elevator takes 2.6 ss to brake to a stop, with a constant acceleration, at the first floor.What is the force the elevator exerts on Zach while the elevator is braking?

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