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Math Help - time for ball to hit the ground

  1. #1
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    time for ball to hit the ground

    I've tried this problem 4 times now and i keep getting the wrong answer. I thought it would be a simple quadratic equation problem but I'm just not getting it.


    A baseball is “popped” straight up by a batter. The height of the ball above the ground is given by the function , where t is time in seconds after the ball leaves the bat and y is the height of the ball in feet.

    It wants me to find at what time the ball hits the ground.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by xacsempire View Post
    I've tried this problem 4 times now and i keep getting the wrong answer. I thought it would be a simple quadratic equation problem but I'm just not getting it.


    A baseball is “popped” straight up by a batter. The height of the ball above the ground is given by the function , where t is time in seconds after the ball leaves the bat and y is the height of the ball in feet.

    It wants me to find at what time the ball hits the ground.
    Hi xacsempire,

    I don't know if anyone else can see it, but I cannot see your function. Can you just type it out?
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  3. #3
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    The function is y=f(t)= -5t^2+40t+4

    heres what the graph looked like.
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  4. #4
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    Quote Originally Posted by xacsempire View Post
    The function is y=f(t)= -5t^2+40t+4

    heres what the graph looked like.
    Then the ball "hits the ground" when y= 0. Solve -5t^2+ 40t+ 4= 0 by factoring, or completing the square, or using the quadratic formula.
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