In the figure shown initially spring is in unstretched state and blocks are at rest. Now 100 N force is applied on block A arrd B as shown in figure. After some 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 stretched by amount 30 crn. Then work done by spring force on A will be:

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93 J

-6 J

6 J

None of these

answer is B.

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Detailed Solution

Wspring +W100N=Δk( on A)Wspring +(100)10100=12(2)(2)2Wspring =4−10=−6J

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