As i was doing a chapter review, I came across this question. I have tried to solve it, to now avail, I do not know where to begin. No solution was given in the textbook, and I would like to know how to solve it. Thanks for taking your time to help me. Question: A railroad flatcar of weight W can roll without friction along a straight horizontal track.. A man of weight w is standing on the car, which is moving to the right with a speed v. What is the change in the velocity of the car if the man runs to the left so that his speed relative to the car is Vrel just before he jumps off the left end?