## College Physics (4th Edition)

The elevator floor pushes up on Oliver with a force of $642.4~N$
Let $F_N$ be the normal force of the elevator pushing up on the person in the elevator. Let $M$ be the person's mass. $\sum F = Ma$ $Mg-F_N = Ma$ $F_N = M~(g-a)$ $F_N = (76.2~kg)~(9.80~m/s^2 - 1.37~m/s^2)$ $F_N = 642.4~N$ The elevator floor pushes up on Oliver with a force of $642.4~N$