Physics-
General
Easy
Question
A block of mass m is kept in an elevator which starts moving downward with an acceleration 
as shown in figure. The block is observed by two observers A and B for a time interval 
.According to the observer A
- the work done by gravity is zero
- the work done by normal reaction is zero
- the work done by pseudo force is zero
- all the above
The correct answer is: all the above
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