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July 29, 2014

Homework Help: physics

Posted by physics on Wednesday, July 21, 2010 at 1:28pm.

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2720 N) as it rolls at 18.5 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 55.00 m/s relative to the flatcar. What is the resulting increase in the speed of the flatcar?

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