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 ins†an t 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) \surd u2-2gL (b) \surd2gL (c) \surd u2-gl (d) \surd2(u2-gL)

A stone tied to a string of length L is whirled in a vertical circle

1.	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 ins†an t 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) \surd u2-2gL (b) \surd2gL (c) \surd u2-gl (d) \surd2(u2-gL)
Answer» 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 ins†an t 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) \surd u2-2gL (b) \surd2gL (c) \surd u2-gl (d) \surd2(u2-gL)

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