NEET | 2013FrictionMedium
Question
The upper half of an inclined plane with inclination φ is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by
Options
A.2 sin φ
B.2 cos φ
C.2 tan φ
D.tan φ
Solution
Workdone by gravity = Wfr
mg s sin φ = μmgcos φ.
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