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## Homework Statement

You have a level track. You push a cart with mass = 1.12[kg].

You measure the initial velocity to be 0.57[m s-1].

2 seconds later, you measure the velocity to be 0.427[m s-1].

## Homework Equations

What is the work (reported in mJ) that friction did on the cart?

## The Attempt at a Solution

W(f)=F(f) x d