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In which case is positive work being done? a) An eastward force is applied to...

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Physics

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In which case is positive work being done? a) An eastward force is applied to an eastward moving soccer ball that is already moving at a constant velocity to increase its speed in that direction. b) A cart moving at a constant velocity of 10 m/s [W] when a 0.5 N [E] force is applied. c) Earth applies a force on the Moon as the Moon travels one complete rotation in orbit around the Earth. d) The work done by air resistance on a ball as the ball, which was initally at rest, falls 3.0 m down towards Earth. e) The work done by air resistance as a baseball is thrown horizontally towards the catcher.

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