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    A particle travels in a straight line with uniform acceleration, passing through 3 points; A, B and C in that order at times t=0, t=2 and t=5 respectively. If BC=30m and the speed of the particle when at B is 7ms-1, find the acceleration of the particle and its speed when at A

    I'm not sure where to to start wth this question please help!
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    Use SUVAT equations.
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    (Original post by Carokelly123)
    A particle travels in a straight line with uniform acceleration, passing through 3 points; A, B and C in that order at times t=0, t=2 and t=5 respectively. If BC=30m and the speed of the particle when at B is 7ms-1, find the acceleration of the particle and its speed when at A

    I'm not sure where to to start wth this question please help!
    Form simultaneous equations for u=v_A and a using the two conditions you've been given. Hint:
    Spoiler:
    Show
    v=u+at at B and s=ut+\frac{1}{2}at^2 at C.
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    (Original post by joostan)
    Form simultaneous equations for u=v_A and a using the two conditions you've been given. Hint:
    Spoiler:
    Show
    v=u+at at B and s=ut+\frac{1}{2}at^2 at C.
    I still can't get it 😕
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    (Original post by Carokelly123)
    I still can't get it 😕
    Can you show us your work?
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    (Original post by Carokelly123)
    I still can't get it 😕
    Well, the first is reasonably simple, a standard use of v=u+at - I'll leave you to do that.
    The second, however, is a little more complicated - you need to consider s=u \Delta t +\frac{1}{2}a\Delta t^2 for some convenient \Delta t.
    Bigger hint:
    Spoiler:
    Show
    What if \Delta t = (t_C-t_B), where the subscript means the time at that point?
 
 
 
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