Duration: 4:03

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A pendulum of mass \( \mathrm{m} \) and length \( l \) is released from rest in a horizontal position. A nail at a
P distance \( \mathrm{d} \) below the pivot, causes the mass to

W move along the path indicated by the dotted line. The minimum distance such that the mass will swing completely round in the circle shown in figure is \( \mathrm{d} \) then \( \frac{5 \mathrm{~d}}{\ell} \) is
(1) 2
(2) 3
(3) 4
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