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The electric motor of a model train accelerates the train from rest to 0.780 m/s in 33.0 ms. The total mass of the train is 510 g. Find the average power delivered to the train during its acceleration.

  • physics -

    a = (Vf - Vo) / t,
    a = (0.78 - 0) / 0.033s = 23.64m/s^2.

    Fn = ma = 0.51 * 23.64 = 12.06N. = Net
    force.

    W = F*d / t = 12.06 * 0.01287 / 0.033 =
    4.7J.

  • physics -

    Correction: Po = F*d/t = 4.7Watts.

  • physics -

    where did you get the value .01287 for d when calculating for work in the last step of the problem

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