JEE Main Physics question
If the mass of A is 10 kg, coefficient of static friction = 0.22, coefficient of kinetic friction = 0.2, then the minimum mass of B (hanging via a pulley, pulling A) to start the motion is
Answer: (B)
Solution
Motion begins when g just exceeds the limiting static friction on A: = μ_s = 0.22×10 = 2.2 kg.