Question

the velocity of small ball of mass m and denssity when dropped in a container filled with glycerine become constant after some time . if the density of glycrion is viscous force acting on glycerine

Answer 1

your question is not write. sorry for that.
however I can say one thing related to this i.e after some time the ball attained terminal velocity in which mg(downward force) and viscous force(upward force) both are of same magnitude.

Answer 2

$mg(1 - \frac{ d_{2} }{ d_{1} } )$

its correct answer....