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1. |
Air is a _________ fluid, it exerts force on a moving object, and when a person in free fall reaches a speed of about 180 ft/s (120 nules per hour), the air resistance force is equal to the force of gravity, and one stops accelerating. This is known as terminal velocity. |
A. | tNon viscous |
B. | tViscous |
C. | tConstant |
D. | tGravity free |
Answer» C. tConstant | |