Figure shows two blocks A and B, each having a mass of 320 g connected by a light string passing over a smooth light pulley. The horizontal surface on which the block A can slide is smooth. The block. A is attached to a spring of spring constant 40 N/m whose other end is fixed to a support 40 cm above the horizontal surface. Initially, the spring is vertical and unstretched when the system is released to move. Find the velocity of the block A at the instant it breaks off the surface below it. Take g = 10 m/s 2 .
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
The given data is
From the free body diagram,
(when the block breaks off 
)
So, 
Let the velocity of the body at B be 
Charge in K.E. = work done (for the system)
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