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Math Help - Please check my answer to this problem

  1. #1
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    Please check my answer to this problem

    If a ball is given a push so that it has an initial velocity of 5 m/s down a certain inclined plane, then the distance it rolled arter t seconds is s = 5t + 3t^2.

    a) Find the velocity after 2 seconds?
    v(t) = 5 + 6t
    v(2) = 5 + 6(2)
    V(2) = 17

    b) How long does it take for the velocity to reach 35 m/s?

    35 = 5 + 6t
    -5 -5
    30 = 6t
    so I divided 30/6 = 6t/6

    5 seconds




    Am I right?
    Last edited by qbkr21; March 20th 2007 at 07:15 PM.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by qbkr21 View Post
    If a ball is given a push so that it has an initial velocity of 5 ms/s down a certain inclined plane, then the distance it rolled arter t seconds is s = 5t + 3t^2.

    a) Find the velocity after 2 seconds?
    v(t)= 5 + 6t
    You didn't complete this. plug in 2 for t and you've got the answer.



    b) How long does it take for the velocity to reach 35 m/s?

    35 = 5 + 6t
    -5 -5
    30 = 6t
    so I divided 30/6 = 6t/6

    5 m/s
    Am I right?
    this is right, except the units. it's 5 seconds, not 5 m/s. m/s is velocity, they asked for time
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