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NEET 1995 (AIPMT) · Simple Pendulum

Simple Pendulum question from NEET 1995 (AIPMT)

Q89NEET 1995 · AIPMTMedium

Simple Pendulum

A simple pendulum with a bob of mass $m$ oscillates from $A$ to $C$ and back to $A$ such that $PB$ is $H$ . If the acceleration due to gravity is $g$ , then the velocity of the bob as it passes through $B$ is

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Answer: (b)

At A the bob is momentarily at rest; B is lower than A by $H$ .
Energy conservation: $mgH = \frac{1}{2}mv_B^2$ .
So the answer is (b) $v_B = \sqrt{2gH}$ .

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