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## Homework Statement

A 900 kg car is parked on a hill when its brakes fail. It begins to roll down the hill,which is at a 15 degree angle above the horizontal.The coefficient of rolling friction is 0.1. What is the car's speed after it has rolled 20m?

## Homework Equations

F=ma

v

^{2}=2aΔx

## The Attempt at a Solution

a=9.8(sin15)-0.1(9.8)(cos15)

v

^{2}=2.54-0.947

v=1.6 m/s

Looks good to me! Is it right?

Thanks!