1.

A body takes time t to reach the bottom of an inclined plane of angle q with the horizontal. If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is

A.             \[\frac{3}{4}\tan \theta \]       
B.             \[\frac{2}{3}\tan \theta \]
C.             \[\frac{1}{4}\tan \theta \]
D.               \[\frac{1}{2}\tan \theta \]
Answer» B.             \[\frac{2}{3}\tan \theta \]


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