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A block of mass M is being pulled along ...

A block of mass M is being pulled along rough horizontal surface. The coefficient of friction between the block & surface is `mu`. If another block of mass M/2 is placed on the block & it is again pulled on the surface. The coefficient of friction between the block and surface will be

A

`mu`

B

`3mu//2`

C

`mu//2`

D

`2mu`

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The correct Answer is:
A
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