A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of ...

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A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass \( m \) kept on the floor of the lift is pulled horizontally. If the coefficient of friction is \( \mu \), then the frictional resistance offered by the body is
[DPMT 2004]
(a) \( \mathrm{mg} \)
(b) \( \mu \mathrm{mg} \)
(c) \( 2 \mu \mathrm{mg} \)
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