Posted by **Bobby** on Saturday, February 15, 2014 at 2:04am.

An 80 kg hiker climbs a 1000 m high hill at a constant speed. If the hiker's body is 25% efficient, how many kg of fat does the hiker burn in climbing the hill? Given: heat of reaction of body fat is 37000 kilo joules per kilogram.

I know that change in potential energy is 800,000. I just don't know what to do next.

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