Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor.
(a) What is Zach's apparent weight before the elevator starts braking?
(b) What is Zach's apparent weight while the elevator is braking?

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  1. a) weight= mg+ma=m(g+0)
    b) weight= m(g+12/3.5)

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