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M1 dynamics question watch

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    A (0.3kg) is on a rough horizontal plane and B (0.5kg) is hanging from a pulley P attached at the end, with 0.6m between B and the ground
    There is 1m between A and P. The coefficient of friction of the plane is 0.4.
    I have already worked out the acceleration of the particles which is 4.655
    When B hits the ground it doesnt rebound.
    *Find the speed of A as it reaches P

    (the answer is 1.57 to 3sf)

    Please go through the method for this question and how you achieve the correct answer
    Many thanks
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    Assuming A and B are joined by string...

    1) find the speed of A after it has travelled 0.6m, using constant acceleration equations (same as speed of B)
    2) work out new acceleration of A (deceleration) now that there is no tension in the string
    3) use the constant acceleration equations, you know u, a and s

    Post your working if you don't get the right answer.
 
 
 
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Updated: May 19, 2010

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