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March 1, 2015

Homework Help: Physics

Posted by URGENT!!!!PLEASE on Sunday, November 23, 2008 at 12:00am.

A steel ball has a mass of 4.0kg and rolls along a smooth, level surface at 62m/s.

A) Find its kinetic energy(i got this and its 7688 joules)

B)?????-At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 meters to give it the speed of 62m/s. What was the magnitude of the force??

I really don't understand part b. please help in detail! Thxs PS- i need to use energy work formuals. no kinematics formuals

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