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Math Help - Find average velocity

  1. #1
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    Find average velocity

    If a rock is thrown upward on the planet Mercury with a velocity of 12 m/s, its height in meters t seconds later is given by y = 12t - 1.86t^2.

    Find the average velocity for the time period [1, 2].

    Well, I did it and got it right:

    Plugged 1 into the equation and got 10.14. Then plugged 2 in and got 16.56.
    16.56-10.14 = 6.42

    Now for the second part: [1, 1.5].
    I did the same thing and got 13.185-10.14 = 3.675 and I got it wrong for some reason...

    UPDATE: Haha, I forgot to divide by .5. NVM Then, please delete this thread.
    Last edited by zweevu; September 16th 2009 at 07:39 AM.
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  2. #2
    MHF Contributor Calculus26's Avatar
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    Remember vave = (y(t2)-y(t1))/(t2-t1)

    you got the right answer in the first because 2 - 1 is 1

    but in the second t2 -t1 = .5

    so divide you result by .5
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