Question

A spherical ball is dropped in a long column of a viscous liquid. The speed $(v)$ of the ball as a function of time $(t)$ may be best represented by

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

Gravity first causes spherical ball to fall with increasing speed, but as it speeds up backward dragging force i.e. viscous force increases. Eventually the viscous force is enough to balance the force of gravity, so the acceleration stops and the sphere reaches a constant terminal velocity.