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A block 'P' of mass 5kg is placed on a...

A block 'P' of mass 5kg is placed on a block 'Q' of mass 10kg which is placed on a smooth surface and both blocks are connected with a light string which is passing over an ideal pulley as shown as in figure.Force of magnitude 10N is applied on the block and coefficient of friction between the blocks in `0.4`.The tension in the string will be

A

`20` N

B

`5` N

C

`15` N

D

`10` N

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