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I am doing in this way:

[1] calculate the kinetic energy before(1/2*m1*u1 + 1/2*m2*u2)

[2] use the conservation of momentum to calculate the velocity after(v=(m1u1+m2u2)/(m1+m2))

[3] calculate the kinetic energy after(1/2*(m1+m2)*v)

this way we can get the answer, it is c

I wish to know is there a way to shorten this procedure by employing the the relationship ke=(p)^2/2m? Of course the answer can be no :)

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# Homework Help: Possibility to shorten the solving procedure (q13)

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