When a ball is released from rest in a very long column of viscous ...

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When a ball is released from rest in a very long column of viscous liquid, its downward acceleration is ' \( a \) ' (just after release). Its acceleration when it has acquired two third of the maximum velocity is \( \mathrm{a} / \mathrm{X} \). Find the value of \( \mathrm{X} \).
(a) 2
(b) 3
(c) 4
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