The figure shows a pendulum bob that is moving in a vertical plane. At an angle theta 0° it has a velocity of 8m/s. The bob has a mass of 2kg, what is the tension in the rope holding the bob at its initial position and when it reaches an angle theta 30°? Neglect the size of the bob.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.