Physics-
General
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Question

A block of mass m is kept in an elevation which starts moving downward with an acceleration a as shown in figure. The block is observed by two observers A and B for a time interval t subscript 0 end subscript. According to the observer A

  1. the work done by gravity is zero    
  2. the work done by normal reaction is zero    
  3. the work done by pseudo force is zero    
  4. all the above    

The correct answer is: all the above

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