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Physics-

Two blocks of masses m subscript 1 end subscriptand m subscript 2 end subscript 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 µ.

Physics-General

  1. spring will be in its natural length under all conditions    
  2. spring will neither be compressed nor be stretched for a blank µ g    
  3. spring will be compressed if a blank µ g    
  4. spring will be stretched if a blank greater than blank µ g    

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

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