A block of mass M is being pulled along rough horizontal surface. The coefficient of friction between the block & surface is $μ$ 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

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$μ$

$3 μ /2$

$μ /2$

$2 μ$

answer is A.

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Detailed Solution

$μ$ depends on nature of surface only, here the coefficient friction between block and surface will remain as $μ$ , even another block is placed on the first block.

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