I need a typed answer without wasting time .

Please solve fast.

I will give you a helpful rating if you solve fast and correct. Also give some explanation

[2E] An ant, with mass 5 milli-grams, is dropped from the top of a skyscraper. Assume that the force from air drag is directly proportional to velocity and that the drag coefficient is 2.5 x 10- kg/s. The ant's speed when it hits the ground is m/s. (Choose the closest answer). X 10-5 [b] 2 [c] 4 [d] 20 [e] 2 X 1012