A block m is kept stationary relative to cage on a rough inclined surface of an accelerating cage as shown in the figure. At the given instant,

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Work done by frictional force on the block is negative in any time interval

Normal reaction performs positive work on the block in a given time interval

Power delivered by normal reaction relative to cage is zero

Net work done by normal reaction and friction between the block and cage is zero in any time interval

answer is A, B.

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