Solution:
From Principal of conservation of Energy in absence of non-conservative forces,
Ui+ Ki= Uf+ Kf
⇒ Ui- Uf= Kf - Ki
⇒ Loss in Potential Energy = Gain in Kinetic Energy
⇒ Gain in Kinetic Energy = m.g. l .cos 30° = √3mgl/2
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
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