The upper half of an inclined plane with inclination φ is perfectly...

The upper half of an inclined plane with inclination

\phi

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

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

Options

A $2 \sin \phi$
B $2 \cos \phi$
C $2 \tan \phi$
D $\tan \phi$

Correct answer

C. $2 \tan \phi$

Step-by-step solution

m g s \sin \phi=\mu m g \cos \phi \cdot \frac{s}{2}

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