A ball A collides elastically with an another identical ball B with velocity 10 m/s at an angle of from the line joining their centres $C_{1}$ and $C_{2} .$ Select the correct alternative(s).

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Velocity of ball A after collision is 5 m/s

Velocity of ball B after collision is $5 \sqrt{3} m / s$

Both the balls move at right angles after collision

Kinetic energy will not be conserved here, because collision is not head on

answer is A, B, C.

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Detailed Solution

Velocity components in common tangent direction will remain unchanged while velocity components in common normal direction are interchanged in case of an elastic collision. Hence, both A and B move at right angles after collision with $v_{A} = 5 m / s$ and $v_{B} = 5 \sqrt{3} m / s .$ Kinetic energy is conserved in an elastic collision. Whether it is a head on collision or an oblique collision.