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March 29, 2017

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The escalator that leads down into a subway station has a length of 29.5 m and a speed of 1.6 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the escalator, what speed must the student exceed in order to beat this record?

  • physics - ,

    student speed = s
    student speed over ground = (s-1.6)
    29.5 = (s-1.6)(11)
    solve for s

  • physics - ,

    1.67

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