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Math Help - Functions help

  1. #1
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    Functions help

    A soccer ball is kicked into the air so that its height, h in metres, after t seconds is modelled by the function h(t)= -4.9t(squared)+12t+0.5

    h=0.05

    Estimate the instantaneous rate of change of the height of the ball after 2 s.

    I got -7.6, but I'm not sure if that's right, any help would be appreciated
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  2. #2
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    Re: Functions help

    You are correct.
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  3. #3
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    Re: Functions help

    Thank you!
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  4. #4
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    Re: Functions help

    Quote Originally Posted by lucida View Post
    A soccer ball is kicked into the air so that its height, h in metres, after t seconds is modelled by the function h(t)= -4.9t(squared)+12t+0.5

    h=0.05

    Estimate the instantaneous rate of change of the height of the ball after 2 s.

    I got -7.6, but I'm not sure if that's right, any help would be appreciated
    It's easier to check for mistakes if you show your working. Otherwise, we have to spend time getting an answer and comparing it against yours.

    Calculating \frac{h(2.01) - h(2)}{0.01} for example will give a close answer.
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