- #1

Peach

- 80

- 0

## Homework Statement

An 85-N box of oranges is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 m/s each second. The push force has a horizontal component of 20 N and a vertical component of 25 N downward.

## Homework Equations

Basically, f=ma

## The Attempt at a Solution

Okay, this is what I attempted. I drew a FBD, so the eqn I came up with is

fk - Fx = 0

fk = Fx

fn - w - Fy = 0

fn = w + Fy

And since fk = uk(fn)

Then shouldn't uk = Fx/(w+Fy)?

I know that's wrong because I didn't include the velocity. But I don't know how to integrate the velocity in there. If it's slowing down, that's only because of the friction force right? And at a constant rate just means the acceleration is zero....What other logic am I missing? Many thanks in advance.