A ball of radius r and density ρ ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is η η , the value of h is given by
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Velocity of ball when it strikes the water surface 
..........(i)
Terminal velocity of ball inside the water 
..........(ii)
Equating (i) and (ii) we get 
⇒ ⇒ 
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