# Physics

A snowmobile does 400J of work in towing a sled to the top of a hill. During th etrip up the hill, it took 50J to overcome the work of friction. What is the potential energy of the motionless sled at the top of the hill?

Well I know that the formula for potential energy is mass * 9.8 m/s sq. * height.

But I can't figure this out.

Help?!

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1. work done - friction= PE change

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👤
bobpursley
2. thanks.

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3. A 500 kg car has an engine that uses only 40% of the energy from the gasoline for motion. If there is 15,000J of potential energy stored in the gasoline, how fast an the car go on the gasoline?

I have no idea how to set this up. Any help?!

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