A railroad flatcar of weight 7840 n can roll without, Physics

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A railroad flatcar of weight 7840 n can roll without

A railroad flatcar of weight 7840 N can roll without friction along a straight horizontal track. Initially, a man of weight 557 N is standing on the car, which is moving to the right with speed 25 m/s; see the figure. 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 8.0 m/s?

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