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Math Help - Physics Help Quick Please!!

  1. #1
    Senior Member sakonpure6's Avatar
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    Physics Help Quick Please!!

    I am starting to panic....

    How do you find the average velocity from a Velocity-time graph. The graph has a slope of 0.75 and starts at (0,6) and ends at (8,12)

    I calculated V.avg = 9. (( 6+ 12)*0.5) but the answer sheet says 12? How?

    And, in general how do you find the acceleration from a position- time graph?

    edit: I was looking at the wrong answer sheet >.< for the first part it is 12!
    but I still don't know how to find the acceleration from a position - time graph, easily. I know I am supposed to find the instantaneous velocity at several points and then construct a velocity - time graph. But is there an easier way?
    Last edited by sakonpure6; February 25th 2013 at 02:29 PM.
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  2. #2
    Super Member ILikeSerena's Avatar
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    Re: Physics Help Quick Please!!

    Hi sakonpure6!

    Quote Originally Posted by sakonpure6 View Post
    I am starting to panic....

    How do you find the average velocity from a Velocity-time graph. The graph has a slope of 0.75 and starts at (0,6) and ends at (8,12)

    I calculated V.avg = 9. (( 6+ 12)*0.5) but the answer sheet says 12? How?

    edit: I was looking at the wrong answer sheet >.< for the first part it is 12!
    If the velocity is 6 at the beginning and 12 at the end, the average velocity can hardly be 12!?!
    Your answer of 9 is correct based on the information you gave.
    It does require constant acceleration, but you have that, since it's a straight line.

    And, in general how do you find the acceleration from a position- time graph?

    but I still don't know how to find the acceleration from a position - time graph, easily. I know I am supposed to find the instantaneous velocity at several points and then construct a velocity - time graph. But is there an easier way?
    Nope. That's the way to do it.
    If the acceleration is constant, you only need 2 instantaneous velocities though.
    Thanks from sakonpure6
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  3. #3
    Senior Member sakonpure6's Avatar
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    Re: Physics Help Quick Please!!

    great! Thank you very much! Now, I think I'm well prepared for my test tomorrow!
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  4. #4
    Super Member ILikeSerena's Avatar
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    Re: Physics Help Quick Please!!

    Good luck!
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