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? asked in Science & MathematicsEarth Sciences & Geology · 2 months ago

How long does it take the rock to travel 99 feet?

A rock is dropped from a building. The equation below gives the distance, d, the rock travels in t seconds.

d=t2+2t

How long does it take the rock to travel 99 feet?

2 Answers

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  • Jim
    Lv 7
    2 months ago

    d=t2+2t

    99 = t² + t

    t² + t -99 =0, then use Quadradic Equation:

    t ≈ 9.46 s

  • Morningfox
    Lv 7
    2 months ago

    Just solve 99 = t^2 + 2t.

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