Homework Help: Physics

Posted by Tammy on Monday, February 5, 2007 at 3:21pm.

A railroad flatcar of weight W can roll without friction along astraight horizontal track. Initially, a man of weight w is standing on the car, which is moving to the right with speed v_0. What is the change in velocity of the car if the man runs to the left so that his speed relative to the car is v_rel?

I know that the man and the flatcar are moving inopposite directions. Would the answer be: v_f-v_m= mv/(m_flatcar - m_man)?

The mans change in momentum (-mv) relative to the original moving axis (speed v0) added to the change in car momentum is zero.

W(deltaV)+ w(-v)= 0

deltaV= w/W (v)

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