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## Homework Statement

A 320 kg car slides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the car and the hill surface is 0.23.

1) If the gravitational potential energy PE of the car-Earth system is set to zero at the bottom of the hill, what is the value of PE just before the slide?

2) How much mechanical energy is wasted by frictional forces during the slide?

## Homework Equations

PE = mgh

Frictional force = (kinetic friction) * (mg cos theta)

Work = Final Energy - Initial Energy

## The Attempt at a Solution

I tried to solve the first question with the potential energy equation but I am having trouble solving the second equation.