4.6 Projectile Motion Revisited: The Effect of Air Drag A sphere is dropped from a great height and when its speed reaches 20 m/s, its acceleration downward is 8.4 m/s 2 . If the drag force is proportional to the square of the speed, what will be its acceleration downward when its speed reached 40 m/s?

0 m/s 2 because it has now reached terminal velocity.

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4.6 Projectile Motion Revisited: The Effect of Air Drag A sphere is dropped fr...

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4.6 Projectile Motion Revisited: The Effect of Air Drag

A sphere is dropped from a great height and when its speed reaches 20 m/s, its acceleration downward is 8.4 m/s². If the drag force is proportional to the square of the speed, what will be its acceleration downward when its speed reached 40 m/s?

4.2 m/s²

0 m/s² because it has now reached terminal velocity.

8.0 m/s²

2.6 m/s²

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