A small block is freely sliding down from top of a smooth inclined plane. The block reaches bott...

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A small block is freely sliding down from top of a smooth inclined plane. The block reaches bottom of inclined plane then the block describes vertical circle of radius \( 0.5 \mathrm{~m} \) along smooth track. The minimum vertical height of inclined plane should be
(a) \( 1 \mathrm{~m} \)
(b) \( 1.25 \mathrm{~m} \)
(c) \( 3 \mathrm{~m} \)
(d) \( 2.5 \mathrm{~m} \)
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