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A block of mass m is kept on a wedge of ...

A block of mass `m` is kept on a wedge of mass `M` . Initially the system is held. At certain time the system is released and the wedge is observed to move with acceleration `A` on inclined surface as shown. There is no friction anywhere. The acceleration of block `(m)` with respect to wedge `(M)` will be.
`.`

A

A rightward

B

`A cos theta` rightward

C

A `cos theta` leftward

D

none of these

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The correct Answer is:
B
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