45. A streamlined body falls through air from a height h on the surface of a liquid. If d and D(D > d) represents the densities of the material of the body and liquid respectively, then the time after which the body will be instantaneously at rest, is
(a) √2h/g (b) √(2hD)/gd
(c) √(2hd)/gD (d) √(2hd)/[g(D-d)]
Answer-d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a