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If a stone is tossed from the top of a 210 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 210, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth’s place; include units in your answer.

  • math -

    set
    0 = -9.8t^2 - 10t + 210

    use the quadratic formula, where
    a = -9.8
    b = -10
    c = 210

    I got 4.14 seconds

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