6.Simple Pendulum, Application of Lagrange equation of motion/Classical Mechanics

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Amazing video!!!😍
I had doubt in a question, could you help me with that pendulum problem?🥺

AmanSharma-fhuj
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Madam, I guess that the potential energy is positive and you should replace the sign;
Here;
As V=-mgy and y=-lcosθ so when you put the value of y in V, you get;
V=-mg(-lcosθ) which will becomes,
V=mglcosθ

allrounder