JEE Main & Advanced
Physics
Rotational Motion
Question Bank
Self Evaluation Test - System of Particles Rotational Motion
question_answer
Two objects P and Q initially at rest move towards each other under mutual force of attraction. At the instant when the velocity of P is v and that of Q is 2v, the velocity of centre of mass of the system is
A)v
B)3v
C)2v
D)zero
Correct Answer:
D
Solution :
[d] Centre of mass is at rest \[\therefore \,\,\,{{V}_{CM}}=0\]