What is the best estimate for the velocity of an object in free fall (Vi = 0) with air resistance at the 5th second (metric units)?

Anybody wanna ? (picture included? )

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places