Two identical particles move towards each other with velocity 2 v and v respectively. The velocity of centre of mass is

Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is

Two bodies of masses 5kg and 3kg are moving towards each other with 2ms^(-1) and 4ms^(-1) respectively. Then velocity of centre of mass is

Two particles initially at rest move towards each other due to internal forces. Find the velocity of centre of mass when velocity of one particle is v and that of the other is 2v

A body of mass 20 kg is moving with a velocity of 2v and another body of mass 10 kg is moving with velocity V along same direction. The velocity of their centre of mass is

Velocity of sound is v. Source and observer move towards each other with velocities V_(s) and V_(0) respectively. Wind is blowing with a velocity v_(m) in the direction opposite to the propagation of sound, n is the frequency of the sound. The apparent frequency of the sound heard by the observer is :-

If an alpha particle and a deuteron move with velocity v and 2v respectively, the ratio of their de-Broglie wave length will be ……….