A 72.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is
(a) accelerating upward with an acceleration of 1.80 m/s2,
(b) moving upward at a constant speed, and
(c) accelerating downward with an acceleration of 1.30 m/s2?
I just need to know how to do these problems
W= mg +- mg + when going up, - when down.
W= mg +- ma + when a going up, - when down.