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10d.1 A ball with a radius of 10.0 cm is dropping in the air. The drag coefficient is 0.45. The density of the air is

10d.1 A ball with a radius of 10.0 cm is dropping in the air. The drag coefficient is 0.45. The density of the air is 1.2 kg/m'. What is the drag force when the speed of the ball reaches 20.0 m/s? [Answer: 3.4 N]

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