Q.

When a ball is released from rest inside a very long viscous liquid, its downward acceleration is ‘a’ (just after release). Find the acceleration of the ball when the ball has acquired two third of its maximum velocity.

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a

a3

b

2a3

c

a6

d

None of these

answer is A.

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Detailed Solution

At release,Wefft = (mg –buoyant force) =  ma Viscous force at maximum velocity Weff=Fv 23Weff  is the viscoous force when velocity is 23 of maximum velocity ∴Weff−23Weff=Fnet
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