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JEE Main20266 April 2026Morning ShiftPhysicsLaws of MotionActual

Two blocks ( P and Q ) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a frictionless pulley which is fixed on the edge of a cube ( S ), as shown in the figure below. Block P is positioned on the top surface which has no friction and block Q is in contact with side-surface, having coefficient friction . The cube ( S ) moves towards the right with acceleration of g

Options

  1. A0.33
  2. B0.67
  3. C1
  4. D0.5

Correct answer

B. 0.67

Step-by-step solution

Let us analyze the forces acting on blocks P and Q in the non-inertial frame of reference of the cube S , which is moving to the right with an acceleration a = g 2 = 5 m/s ^2 . In this frame, a pseudo force acts on both blocks towards the left. For block P (mass m_P = 2 kg ): The forces in the horizontal direction are the tension T in the string (acting towards the right) and the pseudo force F_ pP (acting towards the left). Since block P is stationary relative to the cube and there is no friction on the top surfac

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