Two bodies of masses 2 kg and 1 kg are moving along the same line with speeds `2ms^(-1)` and `5 ms^(-1)` respectively. What is the speed of the centre of mass of the system if the two bodies are moving (i) in same direction and (ii) in opposite directions?

Answer

(i) `3ms^(-1)` (ii) `(1)/(3) ms^(-1)`, in the direction of motion of 1kg mass