A pendulum bob with a mass of 039 kg is attached to a 15 m, Ask an Expert

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A pendulum bob with a mass of 0.39 kg is attached to a 1.5 m long string as shown. As the pendulum bob swings from point A, where the angle is (theta) =37 degrees, to point B at the bottom of its arc, decide the change in its gravitational potential energy.

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