Three objects `A` ,` B` and `C` are kept in a straight line on a smooth horizontal
Channel: Doubtnut
Date: 2020-08-16

Three objects `A` ,` B` and `C` are kept in a straight line on a smooth horizontal surface. These have masses `m `, `2m` and `3 m` , respectively . The head - on elastic collision takes place between `A` and `B` and then `B` makes completely inelastic collision with `C`. All motions occur on the same straight line. The final speed of `C` will be