JEE Main Physics question
A body of mass 10 kg is lying on a rough plane inclined at an angle of 30° to the horizontal and the coefficient of friction is 0.5. The minimum force required to pull the body up the plane is
Answer: (B)
Solution
F = mg(sinθ + μcosθ) = 10×9.8×(sin30° + 0.5cos30°) = 98×(0.5 + 0.433) = 98×0.933 ≈ 91.4 N.