Homework Help: Physics

Posted by Bob on Thursday, May 10, 2012 at 7:22pm.

A physics textbook is launched up a rough incline with a kinetic energy of 200 joules. When the book comes momentarily to rest near the top of the incline, it has only gained 180 joules of gravitational potential energy. About how much kinetic energy will it have when it returns to the launch point?

Physics - Elena, Friday, May 11, 2012 at 1:10am
KE -PE = 200 -180 = W(fr).
PE = W (fr) = 180 -20 = 160J
Physics - chenyue, Friday, November 2, 2012 at 12:25am
xixixixixixi i donnot know

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