A block P of mass 4 kg is placed on horizontal rough surface with coefficient of friction μ = 0.6 and two blocks R and Q of masses 2 kg and 4 kg connected with the help of massless strings A and B res

Question

A block P of mass 4 kg is placed on horizontal rough surface with coefficient of friction μ = 0.6 and two blocks R and Q of masses 2 kg and 4 kg connected with the help of massless strings A and B respectively passing over frictionless pulleys as shown, then ( g = 10 m / s 2 )

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Net pull = 40 − 20 = 20 N (left) f ma x ​ = μ N = 0.6 × 4 × 10 = 24 N Since 20 < 24 , the system is at rest. a P ​ = 0 ⟹(A) At rest: T A ​ = 20 N ⟹(B) T B ​ = 40 N ⟹(C) Normal on P = 40 N Friction = 20 N Surface contact force: R = 4 0 2 + 2 0 2 ​ = 20 5 ​ ⟹(D) Answer: A, B, C, D

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JEE Advanced (2028)