Question
The upper half of an inclined plane of inclination θ is perfectly smooth while the lower half is rough. A body starting from the rest at top comes back to rest at the bottom if the coefficient of friction for the lower half is given
Options :
μ= sin θ
μ= cot θ
μ= 2 cos θ
μ= 2tan θ
Answer :
μ= 2tan θ
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