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20 March, 14:43

A crash test dummy is inside a test car moving at 55 km/h. How fast is the dummy moving relative to the seat he is sitting in?

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Answers (2)
  1. 20 March, 14:47
    0
    The dummy is moving with a speed 0 km/h relative to the seat in which it is sitting.

    If the relative speed was non-zero, the dummy would move away from its seat, which contradicts the problem formulation.
  2. 20 March, 14:52
    0
    The situation is exactly the same as YOUR speed relative to the seat you're sitting in, aboard the passenger jet flying at 500 mph with you in it.
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