Bassball starting from rest atop 100m building

[dray]

Homework Statement

perform a calculation for an object moving vertically in air under gravity and experiencing a retarding force proportional to the square of the objects speed. see (W=.5(c_wpAv²)

Object is dropped off a 100 meter building from rest.
radius of object = .0366m
mass = .145 kg
c_w=.5

Homework Equations

F= -mg-W

The Attempt at a Solution

trying to find the velocity I get v=((e^(-2kx)-g)/k)^.5 where k= .5c_wpA

but when I graph it for high values of k I get no graph

 

[kuruman]

Presumably, you have solved a differential equation. what is that equation and how did you get the solution. What does the statement "perform a calculation for an object ..." mean? What are we calculating? You need to be clearer so we can help you.