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July 4, 2015

Homework Help: Physics

Posted by Elisabeth on Saturday, June 5, 2010 at 9:31pm.

A 56.6kg hiker starts at an elevation of 1270m and climbs to the top of a 2660 peak.

(I know the answers to B and C, I just have a question on A)
A) What is the change in the hikers potential energy?

I took PE=mg(h2-h1) and got (56.5)(9.8)(2660-1270)=769643J

When I checked my work with some problems on the net, I was seeing answers as large as mine and others that only used 4 digits (Like 7696J)

Why are they cutting them down, and shouldn't the unit change if they did? If the unit should change... why?

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