A man is running with a constant acceleration on a plank which is placed on a horizontal smooth ...

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A man is running with a constant acceleration on a plank which is placed on a horizontal smooth surface. Then choose the correct option(s):
(A) Work done by friction on the man is negative
(B) Work done by friction on the man is positive
(C) Work done by friction on the plank is positive
(D) Work done by friction on the plank is negative
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