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## Homework Statement

I have a 60kg cart on the back of my truck (travelling at 80km/h) which falls off the back and slides 45m before coming to a stop. I want to find coefficient of kinetic friction

http://img9.imageshack.us/img9/4356/38603897.jpg [Broken]

## Homework Equations

Vf = 0km/h

Vi = 80km/h = 200/9 m/s

s = 45m

using Vf^2 = Vi^2 + 2as,

I find acceleration to be = - 4000/729 m/s^2 which I think is correct up to this point as the negative indicates decelleration

This is where I get confused,

I draw my free body diagram, which way will the force created by acceleration (i.e. F=ma) force act? Will it be to the right or to the left?

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