A stone tied to a string of length L is whirled in a vertical circle with the other end of  the string at the center. At a certain instant of time, the stone is in the lowest position and has speed u. The magnitude of change in velocity as it reaches a point where the string is horizontal is

$$\sqrt{{u^2 - 2gl}}$$

$$\sqrt{{u^2 - 2gl}}$$

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$$\sqrt{{2gl}}$$

$$\sqrt{{2gl}}$$

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$$\sqrt{{u^2 - gl}}$$

$$\sqrt{{u^2 - gl}}$$

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$$\sqrt{{2(u^2 - gl)}}$$

$$\sqrt{{2(u^2 - gl)}}$$

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