An object of mass M M\,M falls vertically through the air. The resistive force acting on the object is given by bv2b v^2bv2, where v v\,v is the speed and b b\,b is a constant. Under the influence of gravity ggg, what is the terminal speed of the object?
Mgb\sqrt{\frac{M g}{b}}bMg
Mgb\frac{M g}{b}bMg
bMg\sqrt{\frac{b}{M g}}Mgb
(Mgb)2\left(\frac{M g}{b}\right)^2(bMg)2
