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Math Help - a physics questions really teasing me

  1. #1
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    a physics questions really teasing me

    a physics questions really teasing me-physicssss.jpgits the part b that i need help in . well i tried to solve it but failed to do so i arrived to equation v= V-u but cant go any furthur as after i plug this in v^2 things get quite complicated
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  2. #2
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    Re: a physics questions really teasing me

    So did you get the equations right in part a? I'll assume you did.

    Rearranging them a little gives:

    u-v=\frac{M}{m}V

    and

    u^2-v^2=\frac{M}{m}V^2

    Factorise the left side of the second equation and everything will become easy.
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  3. #3
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    Re: a physics questions really teasing me

    i didnt actually get it can u please elaborate it a little thanks
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  4. #4
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    Re: a physics questions really teasing me

    a^2-b^2=(a+b)(a-b)
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  5. #5
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    Re: a physics questions really teasing me

    this is how i solve can u point out at what am i doing wrong
    v=V-u equation 2
    mv+MV=mu equation 1
    multiplying eq 2 by M
    we get Mv=MV+Mu equation 3
    adding equation 3 and 1 we get
    v=(m-M)u/(m+M) equation 4
    multiplying eq 2 by m
    mv=mV-mu equation 5
    adding equation 5 and 1 we get
    V=2mu/(m+M)
    plugging these values in the energy loss in kinectic energy
    mu^2{1-(m+M)2-4mM/(m+M)^2 i get 0/(m+M)^2 i know i am close but what i am doing wrong??
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  6. #6
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    Re: a physics questions really teasing me

    can anoyne please help please i got exam tom
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