Q 1125167061.     Three objects `A, B` and `C` are kept in a straight line on a frictionless horizontal surface. These have masses `m, 2m` and `m`, respectively. The object `A` moves towards `B` with a speed `9` m/s and makes an elastic collision with it. Thereafter, `B` makes completely inelastic collision with `C`. All motions occur on the same straight line. Find the final speed (in m/s) of the object `C`.

JEE 2009
A

`0`

B

`1`

C

`2`

D

`4`

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