A force of 75 N at an angle of 15° to the direction of motion moves a chair 3 m. Which change would result in more work being done on the chair?

Work is calculated as W = Fd cos θ, where θ is the angle between the force and the direction of motion. To increase work, the force or distance should increase, or the angle should decrease. Decreasing the angle from 15° to 10° makes more of the force act along the chair’s motion, so choice D, decreasing the angle to 10°, results in more work.

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