Physics
posted by Elisabeth on .
A 44.0 kg man stands on a bathroom scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.90 m/s in 1.19 s. It travels with this constant speed in the upward direction for the next 7.60 s. The elevator then slows down (undergoes a uniform acceleration in the negative y direction) for 2.15 s and comes to rest. What does the bathroom scale register before the elevator starts to move? Answer in units of N. (Hint: What is the velocity of the elevator then?)

The elevator has not moved yet, so the normal force and the force of the man's weight are equal. The answer is 431.2 N
n  mg = ma
n  mg = 0, so
n = mg
n = 44.0*9.8
n = 431.2