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Math Help - Velocity from displacement

  1. #1
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    Velocity from displacement

    Hi the question is as following,
    The displacement of a body after time t is given as s = tsint + cost. Calculate its velocity and acceleration values at t = 3
    (an: -2.970; -1.413)

    I used equation ds/dt = v to find the derivative which is
    v = tcost + sint -sint
    but when i put t = 3 to the equation can't get the right answer, I thought it would be the problem of the derivation but I can't find which goes wrong.
    Last edited by mr fantastic; March 14th 2010 at 07:00 PM. Reason: Changed post title
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  2. #2
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    Quote Originally Posted by yanmingfu View Post
    Hi the question is as following,
    The displacement of a body after time t is given as s = tsint + cost. Calculate its velocity and acceleration values at t = 3
    (an: -2.970; -1.413)

    I used equation ds/dt = v to find the derivative which is
    v = tcost + sint -sint
    but when i put t = 3 to the equation can't get the right answer, I thought it would be the problem of the derivation but I can't find which goes wrong.
    Your derivative is correct so your mistake lies elsewhere.
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  3. #3
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    oh, I just found where goes wrong, when I put t = 3 in equation I forgot to change it the the degree 3 = 171.88 degree thanks anyway.
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