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    A gravitational force case is illustrated.

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    A pendulum swings left to right. At what locations in the pendulum's swing is the gravitational force doing positive work? Negative work? No work? What is happening to the speed of the pendulum in each case?

    Where does the pendulum have the greatest gravitational potential energy? Where does it have the greatest kinetic energy?

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    here is the answer.

    when the pendulum moves from its extreme position to mean positions then work done by gravitational force is positive because displacement and ...

    Solution Summary

    The solution examines the gravitational force case of a pendulum swing. Where the pendulum has the greatest gravitational potential energy is determined.