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A particle of mass m moving with velocity v strikes a stationary particle of mass 2m and sticks to it. The speed of the system will be 

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a
v/2
b
2v
c
v/3
d
3v

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detailed solution

Correct option is C

Initial momentum =  mvFinal momentum =  3mVBy the law of conservation of momentum  mv=3mV∴V=v​/​3

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