The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(\frac{d}{2}\), then the viscous force acting on the ball will be :
1
2Mg
2
\(\frac{Mg}{2}\)
3
Mg
4
\(\frac{3}{2}\) Mg