1
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Question

# block a of mass 2kg rests on another block b of mass 8kg which rests on a horizontal floor. the coefficient of friction between a and b is 0.2 while that between b and floor is 0.5 when a horizontal force 25N is applied on the block b, the force of friction between a and b is:

A
0
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B
6
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C
7
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D
8
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Solution

## The correct option is A 0Block B together with block A is lying on rough surface with coefficient of friction=0.5.(coefficient of friction) × (mA+mB) × g=0.5×10×10=50N.So frictional force=0Hence,option (A) is correct answer.

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