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28. Two persons each of mass m are standing at the twoextremes of a railroad car of mass M resting on a smoothtrack (figure 9-E10). The person on left jumps to the leftwith a horizontal speed u with respect to the state ofthe car before the jump. Thereafter, the other personjumps to the right,again with the same horizontal speedu with respect to the state of the car before his jump.Find the velocity of the car after both the persons havejumped off.Figure 9-E10

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