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A stone tied to a string of length L is whirled in a vertical
circle with the other end of the string at the centre. At a
certain instant of time, the stone is at its lowest position, and
has a speed u. The magnitude of the change in its velocity as
it reaches a position, where the string is horizontal, is
(a) √u² - 2gL
(b) √2gL
(c) √u² - gL
(d) √2 (u² - gL)

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