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Radius of earth is 6400 km while the rad...

Radius of earth is 6400 km while the radius of another planet is around 2800 km. The density of this planet is only 20% of the density of earth. The value of acceleration due to gravity of this planet is

A

`8.6 m//s^(2)`

B

`0.86 m//s^(2)`

C

`4.2 ms//s^(2)`

D

`0.42 m//s^(2)`

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