Araindrop fell directly toward the ground at a constant velocity for 4 seconds. in half of that
time, it fell 18 meters. what was the raindrop's velocity?

the velocity is 6 meters per second

explanation:

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

that is wrong, its not thymus.