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A block of mass 1 kg is placed inside a ...

A block of mass 1 kg is placed inside a car of mass 5 kg , as shown . The block can slide smoothly along horizontal direction. If block is displaced slightly and released , then time period of osciallation is

A

`2pi sqrt((5)/(2k))`

B

` 2pi sqrt((5)/(12k))`

C

`2pi sqrt((12)/(5k))`

D

`2pi sqrt((2)/(5k))`

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