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64. What is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body ?

(The densities of metal  and of liquid are ρ and  σ respectively, and the viscosity of the liquid is η).

(a) [(r2g)/(9η)][ ρ -2σ]                         (b) [(r2g)/(9η)][ 2ρ -σ]

(c)  [(r2g)/(9η)][ ρ -σ]                          (d) [(2r2g)/(9η)][ ρ -σ]

Answer-c

 

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