Question

Where does the center of gravity lie, when a boy is doing sit-ups? Does weight vector pass through the base or move away from the base? Explain.

Answer 1

Answer:

When a boy is doing sit-ups, the center of gravity keeps moving up and down. Thus the centre of gravity is not fixed while doing sit-ups. It keeps changing as the boy stands up or sits down.

The weight vector passes through the base but it also keeps moving slightly.

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