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A stone is 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 a 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


Options:
A .  `sqrt(u^2 - 2gL)`
B .  `sqrt(2gL)`
C .  `sqrt(u^2 - gL)`
D .  `sqrt(2(u^2 - gL))`
Answer: Option D



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