 All right friends, so here is a question on rigid body motion. So let's see what it is about Now two identical particles moving towards each other with velocity to V and V respectively We need to find velocity of center of mass. Okay, so this is a system of two masses. Okay So there are two masses I'll draw a straight line first Okay, so there are two masses. Let's say this is one mass Okay, there is this another mass right both are identical the masses are small m Okay, one is moving with to V and other is moving with V and it is written that they are moving towards each other So this must be the scenario Okay, now velocity of center of mass we need to find out so center of mass of what center of mass of these two masses Okay, so we know that the formula for velocity of center of mass is M1 V1 Plus M2 V2 Divide by M1 plus M2 Okay, now many a time students think that this is a scalar formula. Okay So that is not true. It is a vector equation. Okay, you need to take care of the directions also Okay, but then if vectors are aligned in one straight line, you can treat them like scalars But again, you need to make sure that vector in one direction is positive vector in other direction is negative Okay, so I can say that this direction is Positive and that direction automatically becomes then negative. Okay, so we see M will be equal to M into 2 V Okay, plus M into or minus V this time. Okay divided by M plus M Okay, so you will have V by 2 as the answer Okay, that is how you have to solve this particular question. Thank you