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:

Options

A. `sqrt((2h)/(g))`
B. `sqrt((2h)/(g)(D)/(d))`
C. `sqrt((2h)/(g)(d)/(D))`
D. `(d)/((D-d))sqrt((2h)/(g))`

Explanation

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