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    relative velocity and work done by the train

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    A train moves along the tracks at a constant speed u. A woman on the train throws a ball of mass m straight ahead with a speed v with respect to herself.
    a) What is the kinetic energy gain of the ball as measured by a person on the train?
    b) By a person standing by the railroad track?
    c) How much work is done by the woman throwing the ball and the train?
    d) how much work is done by the train?

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    https://brainmass.com/physics/velocity/relative-velocity-work-done-train-112860

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    A train moves along the tracks at a constant speed u. A woman on the train throws a ball of mass m straight ahead with a speed v with respect to herself. What is the kinetic energy gain of the ball as measured by a person on the train? By a person ...

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