The coefficient of friction between the block and plank is \( \mu \) and its value is such that ...

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The coefficient of friction between the block and plank is \( \mu \) and its value is such that the block becomes stationary with respect to plank before it reaches the other end. Then:
(1) The work done by friction on the block is negative.
(2) The work done by friction on the plank is positive.
(3) The net work done by friction is negative.
(4) Net work done by the friction is zero.
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