Math Grade 11 U

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A water balloon is catapulted into the air so that its height, h, in metres after t seconds is h=-4.9t^2+25t+1.9.
when is the ball 13 m high?

  • Math Grade 11 U -

    put h=13, put it in standard form

    ax^2+bx+c=0
    and use the quadratic equation to solve for x.

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