Three identical spherical balls A, B and C are placed on a table as shown in the figure along a straight line. B and Care at rest initially. The ball A hits B head on with a speed of 10 ms^(-1). Then after all collisions (assumed to be elastic) A and B are brought to rest and C takes off with a velocity of

Three identical spherical balls A, B and C are placed on a table as sh

1.	Three identical spherical balls A, B and C are placed on a table as shown in the figure along a straight line. B and Care at rest initially. The ball A hits B head on with a speed of 10 ms^(-1). Then after all collisions (assumed to be elastic) A and B are brought to rest and C takes off with a velocity of
Answer» `5 MS^(-1)` `10 ms^(-1)` `2.5 m s^(-1)` `7.5 ms^(-1)` Solution :SINCE A, B and C are IDENTICAL balls, if any of the two balls undergo elastic collision, they will exchange their velocities. Thus, when A and B collide, A comes to rest, and B start moving ahead with `10 ms^(-1)` . Similarly, when B collides with C , B comes to rest and C starts moving ahead with a speed of `10 ms^(-1)`.