Two blocks A and B each having mass of 0.32 kg are connected by a light string passing over a smooth pulley as shown in Fig.:

Question

Two blocks A and B each having mass of 0.32 kg are connected by a light string passing over a smooth pulley as shown in Fig.: The horizontal surface on which the block A slides is smooth. The block A is attached to a spring of force constant 40 N/m whose other end is fixed to a support 0.40 m above the horizontal surface. Initially, when the system is released to move, the spring is vertical and unstretched. Find the velocity of the block A at the instant it breaks off the surface below it. [Take g = 10 m/s²]

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