Physics-
General
Easy

Question

In the figure shown initially spring is in unstretched state & blocks are at rest. Now 100 N force is applied on block A & B as shown in the figure. After some time velocity of 'A' becomes 2 m/s & that of 'B' is 4 m/s & block A displaced by amount 10 cm and spring is stretched by amount 30 cm. Then work done by spring (in joule) force on A will be

  1. 9/3 J    
  2. – 6 J    
  3. 6 J    
  4. None of these    

The correct answer is: – 6 J

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