The upper half of an inclined plane with inclination of φ is perfectly smooth while the lower half is rough…..

Q: The upper half of an inclined plane with inclination of φ  is perfectly smooth while the lower half is rough. A body at the top starts from rest will again come to rest at the bottom, the coefficient of friction for the lower half if given by

(a) 2 tan φ

(b) tan φ

(c) 2 sin φ

(d) 2 cos φ

Ans: (a)

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