Question

Calculate the terminal speed of a wooden sphere(density 0.830g/m^3) falling throught air if its radius is 8.00cm and its drag coefficient is 0.500? From what height would a freely falling object reach this speed in the absence of air resistance?

Answer 1

http://hyperphysics.phy-astr.gsu.edu/HBASE/airfri2.html#c3

Calculate cross sectional area, and use the formula.