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Two blocks of different masses are hangi...

Two blocks of different masses are hanging on two ends of a string passing over a frictionless pulley. The heavier block has a mass twice as that of the lighter one. The tension in the string is 60N The decrease in potential energy during the first second after the system is released 2K Joule. Then find the value of K. `(Take g=10m/s^(2))`

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