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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 ρ1(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 of the ball is :

A
Vg(ρ1ρ2)k
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B
Vgρ1k
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C
Vgρ1k
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D
Vg(ρ2<ρ1)k
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