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A rock is dropped from the top of a 400-foot-tall building. Its distance s (in feet) from the top of the building after t seconds is s(t) = 16t^2. How many seconds will it take the rock to hit the ground?

  • Calculus -

    hit the ground == drop 400 ft. So,

    16t^2 = 400
    Now just solve for t.

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