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## Homework Statement

A 75kg man stands in an elevator. What will be the force the elevator exerts on him when:

a) the elevator is at rest

b) the elevator is moving upward with a uniform acceleration of 2.0m/s^2

c) the elevator is moving downward with a uniform acceleration of 2.0m/s^2.

## Homework Equations

Fg = mg

FNet = m(a)

## The Attempt at a Solution

I got the following answers that matched the ones on my worksheet:

a) = 735.75 N [up]

The other two I got from just randomly pluging and adding/subtracting the acceleration of gravity with the uniform acceleration of the elevator.

**However, I don't understand what I did and WHY this is the answer. I am the type that doesn't just take the answer as correct from getting it right, but until it makes sense to me..**

b) F = (75)(9.81 + 2.0)

c) F = (75)(9.81 - 2.0)