Eight drops of a liquid of density `rho` and each of radius a are falling through air with a constant velocity `3.75cms^(-1)` . When the eight drops coalesce to form a single drop the terminal velocity of the new drop will be

Options

A. `1.5xx10^(-2)ms^(-1)`
B. `2.4xx10^(-2)ms^(-1)`
C. `0.75xx10^(-2)ms^(-1)`
D. `15xx10^(-2)ms^(-1)`

Explanation

Terminal velocity of a single drop,
`v=3.75cmc^(-1)=3.75xx10^(-2)ms^(-1)`
`=4xx3.75xx10^(-2)`
`=15xx10^(-2)ms^(-1)`