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## Homework Statement

A force of 40.0N accelerates a 5.0-kg block at 6.0M/s^2 along a horizontal surface.

a. What is the frictional force?

b. What is the coefficient of friction?

## Homework Equations

u= coefficient of friction

m= mass of object

Ff= friction force

g= gravity

u=Ff/mg

## The Attempt at a Solution

I used u=Ff/mg and i got 1.3 for the u. but that is when i used the given acceleration of 6.0 m/s^2, not gravity. is that correct?