Question: A pendulum bob swings from point II to point III along the circular arc indicated in Figure 7-19. (a) Is the work done on the

A pendulum bob swings from point II to point III along the circular arc indicated in Figure 7-19.

(a) Is the work done on the bob by gravity positive, negative, or zero? Explain.
(b) Is the work done on the bob by the string positive, negative, or zero? Explain.

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