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
(A) \dfrac{mgl}{2}
(B) \dfrac{mgl}{\sqrt{2}}
(C) \dfrac{\sqrt{3}}{2}mgl
(D) \dfrac{\sqrt{2}}{3}mgl
Answer: Option (C)
Solution:
