1
IIT-JEE 1998 Screening
MCQ (More than One Correct Answer)
+2
-0.5
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 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
$$\sqrt {{u^2} - 2gL} $$
B
$$\sqrt {2gL} $$
C
$$\sqrt {{u^2} - gL} $$
D
$$\sqrt {2\left( {{u^2} - gL} \right)} $$
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