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There object A ,B and C are kept is a st...

There object `A ,B` and `C` are kept is a straing line a frictionless horizontal surface . These have masses have increase on `2m` and `m` respectively . The object `A` move toward `B` with a speed `9` m//s and makes as elastic collision with a there after `B` makes completely inclesis with `C` . All motion over on the same straight line . Find the first speed of the object `C`

A

3 m/s

B

4m/s

C

5m/s

D

1m/s

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