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A stone is tied to a string of length l and whirled in a vertical circle with the other end

A stone is tied to a string of length l and whirled in a vertical circle with the other end of the string as the centre.At a certain instant of time,the stone is at its lowest position and has speed u.The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is

Options

(a) √2(u² – gl)
(b) √(u² – gl)
(c) u – √(u² – 2gl)
(d) √2gl

Correct Answer:

√2(u² – gl)

Explanation:

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