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Question

A block of mass m is released from top of incline plane of inclination. The coefficient of friction between the block and incline surface is μ(μ<tanθ). Find work done by normal reaction when block moves from top to the bottom.
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A
Zero
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B
μmgtanθ
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C
μmgcosθ
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D
μmgsinθ
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Solution

The correct option is D Zero
WN=0FNΔS
Wg=mglsinθ
Wt=μmgcosθ.l

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