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## Homework Statement

A 40.0kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied horizontal force of 130 N. The coefficient of friction between box and floor is .300.

Find the change in kinetic energy of the box.

## Homework Equations

(delta)K=K(final)-K(initial)

K(final)=1/2mv^2

## The Attempt at a Solution

Work=650. J

(change)Internal Energy=588 J

Fk=118

How do you find the change in Kinetic energy without the velocity?