- #1

Sace Ver

- 79

- 2

Mentor's note: Thread title changed to be decriptive of the problem

## Homework Statement

An electric motor is used to pull a 125 kg box across a floor using a long cable. The tension in the cable is 350N and the box accelerates at 1.2m/s

^{2}(forward) for 5.0s. The cable breaks and the box slows down and stops. Calculating the coefficient of kinetic force?

Given:

m=125 kg

a= 1.2 m/s

^{2}

t= 5.0s

Ft=350 N

## Homework Equations

u

_{k}=F

_{k}/ F

_{N}

## The Attempt at a Solution

Fnet = ma

Fnet = (125kg)(1.2m/s

^{2})

Fnet = 150

Thought F

_{k}would be 350N because that's the F

_{t}.

And then U

_{k}would equal 350N divided by 150 but I got 2.3 when the answer is 0.16 not sure how to get answer?

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