I'm supposed to use calculus to verify that v(t) = sqrt(gm/c(adsbygoogle = window.adsbygoogle || []).push({}); _{d})tanh((sqrt(gc_{d}/m)t)

is a solution to dv/dt=g-(c_{d}/m)v^{2}. I don't understand what was done to achieve the solution.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Using calculus to verify

**Physics Forums | Science Articles, Homework Help, Discussion**