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In the figure shown initial spring is in...

In the figure shown initial spring is in unstretched state and blocks are at rest. Now `100 N` force is applied on block `A and B` as shown in figure. After same time velocity of 'a' becomes `2 m//s` and that of 'B' `4 m//s` and block A displaced by amount `10 cm` and spring is spring is streched by amount `30 cm`. Then work done by spring force on `A` will be:

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