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September 23, 2014

Homework Help: College Physics

Posted by Jeff on Sunday, October 25, 2009 at 10:22pm.

The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s.

(a) What is the velocity of the body at x = 4.0 m?
(b) At what positive value of x will the body have a velocity of 5.0 m/s?

I solved for work by using the changes in kinetic energy and got -75 J but don't see how that helps whatsoever.

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