Question: An 80-kg man rides in an elevator from the ground to an upper floor. The elevator goes from rest to (10 mathrm{~m} / mathrm{s}) in

An 80-kg man rides in an elevator from the ground to an upper floor. The elevator goes from rest to $10 \mathrm{~m} / \mathrm{s}$ in 5 seconds, and then continues at the same constant speed for 10 seconds, before slowing down to a stop in $5 \mathrm{sec}-$ onds. How much push from the elevator floor does the man feel during

(a) the initial acceleration,

(b) the constant-speed phase, and

(c) the final deceleration?

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