JEE Main Physics question
A body takes time t to reach the bottom of an inclined plane of angle θ with the horizontal. If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is
Answer: (A)
Solution
As in Q665/Q667's derivation (general θ this time): sinθ = 4(sinθ−μcosθ) ⟹ μ = (3/4) tanθ.