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A block of mass M is kept in elevator (l...


A block of mass M is kept in elevator (lift) which starts moving upward with constant acceleration b as shown in figure. Initially elevator at rest. The block is observed by two observers A and B for a time interval `t=0` to `t=T`. Observer B is at rest with respect to elevator and observer A is standing on the ground.
Q. The observer A finds that the work done by gravity on the block is

A

`1/2Mg^(2)T^(2)`

B

`-1/2Mg^(2)T^(2)`

C

`1/2MgbT^(2)`

D

`-1/2MgbT^(2)`

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