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Question

A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ2<ρ1. Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v, i.e. Fviscous=kv2(k>0). The terminal speed ofthe ball is :

A
Vgρ1k
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B
Vg(ρ1ρ2)k
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C
Vg(ρ1ρ2)k
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D
Vgp1k
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