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    Hi can anyone help me with part 3ii of this question? For i I got 2u instead of -2u but I don't think that should make a difference? I'm not too sure how to answer this style of questions so I would appreciate any guidance

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    (Which direction have you taken positive, the direction P was travelling in originally or the direction Q was travelling originally?)

    The formula for impulse is mv-mu, so substitute in your values.
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    I took the direction of Q originally to be positive. I've got the equation alright its the terminology, when it says "P on Q" what does that sequence mean/how would I substitute the value I obtained in?

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    Can anyone help??

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    (Original post by clarewithnoi)
    Can anyone help??

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    The impulse exerted by P on Q is equal to the change in Q's momentum (Newton's 2nd law).
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    You just did the impulse in the wrong direction, that's all that means.
 
 
 
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Updated: January 23, 2014
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