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Math Help - algebra

  1. #1
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    algebra

    the formula h= 15t - 5t^2 gives the height 'h' metres of a ball, 't' seconds after it is thrown up into the air.
    (i) find the times when the height is 10m

    i figured out how to do this part of the question, t = 1 or 2 by using the quadratic equation but i still dont understand the second part of the question

    (ii) after how long does the ball hit the ground?

    thanks in advance!
    Last edited by jessica.kh; August 6th 2008 at 06:26 AM. Reason: found answer to (i)
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  2. #2
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    Quote Originally Posted by jessica.kh View Post
    the formula h= 15t - 5t^2 gives the height 'h' metres of a ball, 't' seconds after it is thrown up into the air.
    (i) find the times when the height is 10m

    i figured out how to do this part of the question, t = 1 or 2 by using the quadratic equation but i still dont understand the second part of the question

    (ii) after how long does the ball hit the ground?

    thanks in advance!
    Solve h = 0 for t. (Discard t = 0 as a solution)
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