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# Two blocks of masses and are connected with a massless spring and placed over a plank moving with an acceleration ‘a’ as shown in figure. The coefficient of friction between the blocks and platform is .

- spring will be stretched if
- spring will be compressed if
- spring will neither be compressed nor be stretched for
- spring will be in its natural length under all conditions

## The correct answer is: spring will be in its natural length under all conditions

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