Assertion (A): Raindrops usually hit the earth’s surface with constant velocity.

Reason (R): A falling body through a viscous medium attains constant terminal velocity.

Which of the following is correct?

To determine the correct relationship between the Assertion and the Reason, we need to apply the principles of fluid dynamics:Assertion (A) is Correct: If raindrops were falling in a vacuum, they would accelerate indefinitely due to gravity ($g$). However, because they fall through the atmosphere, they experience air resistance. After falling a certain distance, they stop accelerating and hit the ground at a constant velocity.Reason (R) is Correct: When an object falls through a viscous medium (like air or water), it experiences two main forces: gravity pulling it down and a viscous drag force (air resistance) pushing it up. When these two forces become equal, the net force is zero, and the body continues to fall at a constant speed called terminal velocity.Does R explain A?Yes. Raindrops hit the surface at a constant velocity because the atmosphere acts as a viscous medium that allows the drops to reach their terminal velocity.