word math problem, math homework help

If we assume that air resistance is proportional to the square of the velocity, then the time t in seconds required for an object to reach a velocity v in feet per second is given by:

t=
$\frac{9}{24}\ln \frac{24+v}{24-v},0\le v<24$

Determine the velocity, to the nearest hundredth foot per second of the object after 1.4 seconds.