Question

Consider a person standing in an elevator
that is moving upward at constant velocity v.
The person of mass m has two forces acting
upon him: the downward force m g due to
gravity and the upward supporting force n
exerted by the floor of the elevator.

Answer 1

(a) The forces acting on the person in the elevator moving upward are the downward weight (mg) of the person and the upward normal force of the scale. From Newton’s 2nd law:

Answer 2

∑F = ma = n - mg

Answer 3

Since the motion of the elevator is at constant velocity, we can conclude that n=mg. you can check this, setting a=0, into the formula written by @nevvy217

Answer 4

thx