A block is placed over a large plank. The coefficient of friction between the block and the plan....

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A block is placed over a large plank. The coefficient of friction between the block and the plank is \( \mu=0.2 \). Initially both are at rest, suddenly the plank starts moving with acceleration \( a_{0}=4 \mathrm{~m} / \mathrm{s}^{2} \) with the help of some external force. The displacement of the block in \( 1 \mathrm{~s} \) is \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(1) \( 1 \mathrm{~m} \) relative to ground
(2) \( 1 \mathrm{~m} \) relative to plank
(3) Zero relative to plank
(4) \( 2 \mathrm{~m} \) relative to ground


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