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A block of mass m is kept in an elevator which starts moving downward with...

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Physics

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A block of mass m is kept in an elevator 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 to 2 A mg t The observer B finds that the work done by gravity is 1 B mg t 2 A zero A A A mat2 2 DgS V 8 The observer B finds that work done by normal reaction N is 2 B Na t 2 Na 1 2 According to observer B the net work done on the block is 1 2 B ma t 0 fa B b 0 According to the observer A A the work done by gravity is zero C the work done by pseudo force is zero C mga t 2 0 C A C mga t2 g b AC 2800 Ov 1 D mga t D None of these 1 2 D mga t slount or lannon adi bail B the work done by normal reaction is zero D all the above

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