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A stream-lined body falls through air fr...

A stream-lined body falls through air from a height `h` on the surface of a liquid . Let `d` and `D` denote the densities of the materials of the body and the liquid respectively, if `D gt d`, then the time after which the body will be intantaneously at rest, is:

A

`sqrt((2h)/(g))`

B

`sqrt((2h)/(g)(D)/(d))`

C

`sqrt((2h)/(g)(d)/(D))`

D

`(d)/((D-d))sqrt((2h)/(g))`

Text Solution

Verified by Experts

The correct Answer is:
D
Retardation = net weight/mass `=(F_(B)-mg)/(m)`
`v=u+at` then calculate for value of time .t.
`v=0, u=sqrt(2gh)`
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