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Homework Help: Ballistics- Need quick help, just check answer

  1. Nov 2, 2007 #1
    Please just check my answer.

    Divers at Acapulco dive from a cliff that is 61m high. If the rocks below the cliff extend outward for 23m, what is the minimum horizontal velocity a diver must have to clear the rocks safely?

    x problem

    x=Vx(t)
    23=Vx(t)
    23=Vx(3.52)
    23/3.52=Vx
    Answer is Vx=6.52m/s

    Y problem

    Vy=0m/s
    t=?
    d=-61m
    a=-9.8m/s/s

    d=1/2a(txt)+Vi(t)

    -61=-4.9(txt)
    -61/-4.9=txt
    12.44=txt
    square root 12.44=txt Answer for Time is 3.52 Seconds
     
  2. jcsd
  3. Nov 2, 2007 #2

    Shooting Star

    User Avatar
    Homework Helper

    All correct.
     
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