Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?
Correct answer: B. Viscous force exerted by air
- A. Upward thrust due to air
- B. Viscous force exerted by air
- C. Surface tension effects of water
- D. Force of gravity
Explanation
As a raindrop accelerates, air resistance increases until it balances the effective downward force, so the drop stops accelerating and reaches terminal velocity. This resisting force is commonly described as viscous or drag force exerted by the air.
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