A bob hangs from a rigid support by an inextensible string of length l . It is released from rest when string makes an angle 60 o with vertical. The speed of the bob at the lowest position is

Question

A bob hangs from a rigid support by an inextensible string of length l . It is released from rest when string makes an angle 60 o with vertical. The speed of the bob at the lowest position is, g l, 3 g l, 2 g l, 5 g l

MARKS App · Accepted Answer

This mean h = l 1 - cos ⁡ 60 o ⇒ h = l × 1 2 Velocity of bob v = 2 g h ⇒ v = 2 g l 2 ⇒ v = g l

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