Question

The speed of rain drops per hour​

Answer 1

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The speed at which an object falls increases until the upward force of air resistance equals the downward force of gravity, at which time the object reaches the terminal velocity. We know raindrops come in different sizes, so we need to consider an average size. Let us consider the average raindrop to have a radius of about 0.2 cm and a mass of about 0.034 grams. Aerodynamic engineers would give the rather round shape of a raindrop a drag coefficient of about 0.5. When all the parameters are considered the terminal velocity of a typical raindrop is calculated to be about 9 meters per second or 20 mph. A smaller raindrop of radius 0.15 cm has a terminal velocity of about 7 meters per second or 16 mph. In general, depending upon their size, raindrops fall between 15 and 25 miles per hour no matter how high they are when they begin their descent.

Answer 2

Answer:

written below-

Explanation:

general, depending upon their size, raindrops fall between 15 and 25 miles per hour no matter how high they are when they begin their descent.

Not all falling objects have the low terminal velocity of raindrops. For example, you sometimes see people firing a gun into the air. Rifle bullets can exit the barrel with a speed of 2000 miles per hour.

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