A pendulum in a grandfather clock swings back and forth.Does the force of gravity do positive work on the pendulum at any point in its trajectory? If so,where?

Name: A pendulum in a grandfather clock swings back and forth.Does the force of gravity do positive work on the pendulum at any point in its trajectory? If so,where?
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The Answer of A pendulum in a grandfather clock swings back and forth.Does the force of gravity do positive work on the pendulum at any point in its trajectory? If so,where?

A Pendulum in a Grandfather Clock Swings Back and Forth