0 A block of mass m is kept in an elevator which starts

Last updated: 6/21/2023

0 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 intervalt The observer B finds that the work done by gravity is 1 J mgat 2 The observer B finds that work done by normal reaction Nis Nat A zero B Nat 2 The observer B finds that work done by pseudo force is A zero B ma t C ma t According to observer B the net work done on the block is mg t A mg 1 A ma t B mg t 2 B B ma t 2 C 1 c mgat 2 According to the observer A A the work done by gravity is zero C the work done by pseudo force is zero D all the above D mgat 2 DONO D None of these D mgat0 D mgat 2 B the work done by normal reaction is zero