Centre of Mass 3 Question 25

28. Two balls, having linear momenta p1=pi^ and p2=pi^, undergo a collision in free space. There is no external force acting on the balls. Let p1 and p2 be their final momenta. The following option figure (s) is (are) not allowed for any non-zero value of p,a1,a2,b1,b2,c1 and c2.

(2008,4 M)

(a) p1=a1i^+b1j^+c1k^,p2=a2i^+b2j^

(b) p1=c1k^,p2=c2k^

(c) p1=a1i^+b1j^+c1k^,p2=a2i^+b2j^c1k^

(d) p1=a1i^+b1j^,p2=a2i^+b1j^

Fill in the Blanks

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Answer:

Correct Answer: 28. 5×103

Solution:

  1. Initial momentum of the system p1+p2=0

Final momentum p1+p2 should also be zero.

Option (b) is allowed because if we put c1=c20, p1+p2 will be zero. Similary, we can check other options.



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