A block weighing \( 40 \mathrm{~N} \) travels down a smooth fixed c...

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A block weighing \( 40 \mathrm{~N} \) travels down a smooth fixed curved track \( A B \) joined to a rough horizontal
\( \mathrm{P} \) surface (figure). The rough surface has a friction

W coefficient of \( 0.10 \) with the block. If the block starts slipping on the track from a point \( 2.0 \mathrm{~m} \) above the horizontal surface, the distance it will move on the rough surface is :-
(1) \( 40 \mathrm{~m} \)
(2) \( 20 \mathrm{~m} \)
(3) \( 15 \mathrm{~m} \)
(4) \( 10 \mathrm{~m} \)
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