1.

A particle of mass ‘m’ moving with velocity ‘v’ collides in elastically with a stationary particle of mass ‘2m’. The speed of the system after collision will be – (1) ν/2(2) 3ν (3) ν/3(4) 3ν

Answer»

Answer is (3) ν/3

m1ν1 + 0 = (m+ m2)ν’ 

⇒ ν’ = mν/(m + 2m) = ν/3 



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