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a stone thrown upward from the top of a 320-foot cliff at 128 ft/sec eventually falls to the beach below?

how long does the stone take to reach its highest point?

  • Maaaath - ,

    the height h is

    h(t) = 320 + 128t - 16t^2
    The vertex of this parabola is at t = 4
    So, figure h(4)

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