A simple pendulum is released from A as shown. If m and l represent the mass of the bob and length of the pendulum, the gain in kinetic energy at B is

Question

A simple pendulum is released from A as shown. If m and l represent the mass of the bob and length of the pendulum, the gain in kinetic energy at B is, m g l 2, m g l 2, 3 2 m g l, 2 3 m g l

MARKS App · Accepted Answer

Applying the principle of conservation of energy, ∆ K + ∆ U = 0 ; K - 0 + - m g h = 0 K = m g h = m gl cos 30 ° ∴ K = m g l cos ⁡ 30 ° = 3 2 m g l

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