A marble of mass x and diameter 2r is gently released in a tall cylinder containing honey.

Q: A marble of mass x and diameter 2r is gently released in a tall cylinder containing honey. If the marble displaces mass y (< x) of the liquid, then the terminal velocity is proportional to

(a) x + y

(b) x – y

(c) (x+y)/r

(d) (x-y)/r

Ans: (d)