Problem

Problem

A body takes time tt to reach the bottom of a smooth inclined plane of angle θ\theta with the horizontal. If the plane is made rough, time taken now is 2t2t. The coefficient of friction of the rough surface is a. 34tan⁡θ\frac{3}{4} \tan \theta b. 23tan⁡θ\frac{2}{3} \tan \theta c. 14tan⁡θ\frac{1}{4} \tan \theta d. 12tan⁡θ\frac{1}{2} \tan \theta

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