HELP, I have a test! What is the velocity at t=4s when the object is moving along an...

David

New member
...x-axis? The only force acting on a 2.0-kg object moving along the x axis is shown***. If the velocity vx is +2.0 m/s at t = 0, what is the velocity at t = 4.0 s?

****Because yahoo answers does not permit figures, this is the link for it: http://www.scribd.com/doc/18103173/Serway-Physic-Chapter-9
It is problem 5 in chapter 9. IT IS NOT an advertisement. I know that the answer is provided, but I would like to know how it was derived. Thank you in advance.
 
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