Figure (8-E12) shows two blocks A and B, each having a mass of 320 g connected by a light string

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Figure (8-E12) 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.

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I did not understand integration part of putting variable m

KrakenZYT
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Bhaiya you are great you make Physics too easy

satishkumaryadav
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Sir nlm wale method se integrate krne par answer nhi aa raha

shourya_shri