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A cannon is fixed to the floor of a carr...

A cannon is fixed to the floor of a carriage, which is free to move without friction along a straight track. The combined mass of cannon and carriage is M. The instant cannon fires a cannon ball of mass m with speed u, the velocity of centre of mass of cannon + carriage + ball is

A

`(mu)/M`

B

Zero

C

`(mu)/(m+M)`

D

`(Mu)/(m+M)`

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