Question

A small ball (mass m) falling under gravity in a viscous medium experiences a drag force proportional to the instantaneous speed $\mu$ such that $F_{dIa}.=k\mu$. Then the terminal speed of ball within viscous medium is:

• A. $\frac{K}{mg}$
• B. $\frac{mg}{K}$
• C. $\sqrt{\frac{mg}{K}}$
• D. None of these

Answer 1

The correct option is D None of these

Drag force + upthrust = weight
$\therefore$ $ku+F=mg$
$u=\frac{mg-F}{k}$