The string of a pendulum is horizontal initially. The mass of the bob attached is m. Now the string is released. 'R' is the length of the pendulum. (i) Velocity of the string at the lowest point
A
$$\sqrt{2 gR}$$
B
$$\sqrt{3 gR}$$
C
$$\sqrt{5 gR}$$
D
$$\sqrt{4 gR}$$
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Correct option is B. $$\sqrt{3 gR}$$
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