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Falling object with random pictures taken

  1. Jul 27, 2011 #1
    Suppose I drop a rock off a cliff at height h. As it falls, I snap a million photographs at random intervals. On each picture I measure the distance the rock has fallen. Ignoring air resistance:

    x(t) = 1/2 g t^2
    v(t) = g t

    total flight time = T = Sqrt[ 2 h/g]

    My confusion is that in this statement: "The probablity that the camera flashes in the interval dt is dt/T" I don't see how or why this statement is true.
  2. jcsd
  3. Jul 27, 2011 #2
    That would be true if you snapped exactly ONE pic at a random time. Are you sure you understood the problem right?
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