question_answer

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                   [MP PMT/PET 1998; AIIMS 1999; JIPMER 2001, 02]

A)             \[v/2\]  

B)             2v

C)             \[v/3\]  

D)             3v

Correct Answer: C

Solution :

    Initial momentum = \[mv\] Final momentum = \[3mV\] By the law of conservation of momentum \[mv=3mV\] \\[V=v/3\]