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The velocity of small ball of mass \( M \) and density \( d_{1}= \) when dropped a container filled with glycerine becomes constant after some time. If the density glycerine is \( d_{2} \), the viscous force acting on ball is
(1) \( \frac{M d_{1} g}{d_{2}} \)
(2) \( M g\left(1-\frac{d_{2}}{d_{1}}\right) \)
(3) \( \frac{M\left(d_{1}+d_{2}\right)}{g} \)
(4) \( M d_{1} d_{2} \)
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