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Math Help - Instantaneous Velocity

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    Instantaneous Velocity

    f a ball is thrown into the air with a velocity of 45 ft/s, its height in feet after t seconds is given by y = 45t - 13t^2. Find the instantaneous velocity when t=2.


    Would the answer to this be -7?
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    Quote Originally Posted by bobsanchez View Post
    f a ball is thrown into the air with a velocity of 45 ft/s, its height in feet after t seconds is given by y = 45t - 13t^2. Find the instantaneous velocity when t=2.


    Would the answer to this be -7?
    Is that what you get when you substitute t = 2 into dy/dt? If so, then it's correct.
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    Yes. I took the derivative and substituted 2
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