A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with ...

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A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of \( 0.5 \mathrm{~m} / \mathrm{s} \). What is the height of the plane of circle from vertex of the funnel
(a) \( 0.25 \mathrm{~cm} \)
(b) \( 2 \mathrm{~cm} \)
(c) \( 4 \mathrm{~cm} \)
(d) \( 2.5 \mathrm{~cm} \)
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