Homework Help: Physics

Posted by Monique on Sunday, November 15, 2009 at 7:41pm.

A child riding a bicycle has a total mass of 40kg. The child approaches the top of a hill that is 10m high and 100m long at 5m/s. If the force of friction between the bicycle and the hill is 20N, what is the child's velocity at the bottom of the hill? (Assume no air resistance and that g=9.81m/s)

Physics - bobpursley, Sunday, November 15, 2009 at 7:43pm
Energy used up by friction:20N(100m)
energy gained by bike: 40*9.8*10

Ke at bottom=energy gained minus friction

veloctiy at bottom=sqrt(2KE/mass)

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