A pendulum of length 200 c m is horizontal, when its bob of mass 200 g m , is released. It has 90 % of initial energy when the bob reaches the lower most point. Speed of the bob at this point is

Question

A pendulum of length 200 c m is horizontal, when its bob of mass 200 g m , is released. It has 90 % of initial energy when the bob reaches the lower most point. Speed of the bob at this point is, 8 m s - 1, 4.5 m s - 1, 5 m s - 1, 6 m s - 1

MARKS App · Accepted Answer

v = 2 g h when 100 % energy gets converted. But here 1 2 m v 2 = 0.9 m g h i.e. v = 1.8 g h ⇒ v = 1.8 × 10 × 2 = 6 m s - 1

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