A particle $A$ is moving with a speed of $20\text{m/s}$ towards right and another particle $B$ is moving at a speed of $5\text{m/s}$ towards right. Find their velocity of approach.

Q. A particle $A$ is moving with a speed of $20\text{m/s}$ towards right and another particle $B$ is moving at a speed of $5\text{m/s}$ towards right. Find their velocity of approach.

Q. A particle $A$ is moving with a speed of $10\text{m/s}$ towards right and another particle $B$ is moving at speed of $12\text{m/s}$ towards left. Find their velocity of approach.

Q. A particle A is moving with a speed of 10 m/s towards right, particle B is moving at a speed of 10 m/s towards right and another particle C is moving at speed of 10 m/s towards left. The separation between A and B is 100 m. Find the time interval between C meeting B and C meeting A.

Q. A particle $A$ is moving with a speed $10\text{m/s}$ towards right while particle $B$ is moving at a speed of $10\text{m/s}$ towards right and another particle $C$ is moving at speed of $10\text{m/s}$ towards left. The separation between $A$ and $B$ is $100\text{m}$. Find the time interval between $C$ meeting $B$ and $C$ meeting $A$.

Q. A prticle of mass $m$ moves with velocity $v_0=20\text{m/s}$ towards a large wall that is moving with velocity $v=5\text{m/s}$ towards the particle as shown. If the particle collides with the wall elastically, then find the speed of the particle just after collision. (Assume collision with the wall is elastic)