A pendulum bob swings along its characteristic arc as shown. Rank the gravitational potential energy of the pendulum bob at the three marked locations

Gravitational potential energy is the maximum at point C and lowest at point A

Explanation:

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The energy of pendulum is governed by mechanical energy. Mechanical energy is the sum of potential energy and kinetic energy

Potential energy increases with increasing height. Thus, when the pendulum bob is at maximum height, then its potential energy is also the highest.

Thus, At point C, the gravitational potential energy is the highest

At point A, the  gravitational potential energy  is substantial but lower than that of gravitational potential energy at point C

AT point A, gravitational energy is the lowest

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