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Three stones of equal mass are thrown vertically down from the top of a 200-m high...

  1. Three stones of equal mass are thrown vertically down from the top of a 200-m high building. The initial velocities for the three stones are 2.0 m/s, 5.0 m/s, and 6.0 m/s. What is the velocity (in m/s) of the center mass of the stones along the vertical direction after 3.0 seconds?

    A) -43.9

    B) -16.9

    C) -101.2

    D) -67.5

    E) -33.7

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