The leg muscles of a person exert forces when that person is sitting down in a chair. Is the work positive, negative, or is any work done at all? A. The work is negative.

B. The work is positive.

C. There was no work done.

D. None of these.

1)Positive = Force and displacement in same direction.

2) Negative = Force and displacement in opposite direction.

3) Zero = No displacement, therefore, no work.

4) Negative = Force and displacement in opposite direction.

5) Negative = Force and displacement in opposite direction.

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we need to know the time interval during which the force acts. impulse of force = momentum change