JEE Main 27 June 2022 Shift 2 Solved Paper

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