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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 fritionlas horizental surface . These have masses have increase on `2m` and `m` repectively . The object `A` move toward `B` with a speed `9` m//s and makes as electic collision with a there after `B` makes complately inclesis with `C` . All motion over on the same strangth line . Find the first speed of the object `C`

A

3m/s

B

4m/s

C

5m/s

D

1m/s

Text Solution

Verified by Experts

The correct Answer is:
B
For A and B (elastic collision)- `v_(B)= (2m_(1)u_(1))/(m_(1) + m_(2))= (2 xx mxx 9)/(3m)= 6m//s`
For B and C (inelastic collision)- `2mv_(B)= (2m+ m)v rArr v= (2m xx 6)/(3m)= 4m//s`
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