Three particles $A, B$ & $C$ of equal mass move with speed $V$ as shown to strike at  centroid of equilateral triangle after collision. $A$ comes to rest & $B$ retraces its path  with speed $V$. speed of $C$ after collision is :-

In an elastic collision between disks $A$ and $B$ of equal mass but unequal radii, $A$ moves along the $x$ -axis and $B$ is stationary before impact. Which of the following is possible after impact?

What is head-on collision ?

A ball of mass $10\, kg$ moving with a velocity $10 \sqrt{3}\, ms ^{-1}$ along $X-$axis, hits another ball of mass $20\, kg$ which is at rest. After collision, the first ball comes to rest and the second one disintegrates into two equal pieces. One of the pieces starts moving along $Y-$ axis at a speed of $10\, m / s$. The second piece starts moving at a speed of $20\, m / s$ at an angle $\theta$ (degree) with respect to the $X-$axis. The configuration of pieces after collision is shown in the figure. The value of $\theta$ to the nearest integer is

A ball hits the floor and rebounds after inelastic collision. In this case

What percentage of kinetic energy of a moving particle is transferred to a stationary particle when it strikes the stationary particle of $5$ times its mass? (Assume the collision to be head-on elastic collision)