The mass and diameter of a planet have twice the value of the corresponding parameters of earth. Acceleration due to gravity on the surface of the planet is

Options

A. `9.8m//s^(2)`
B. `4.9m//s^(2)`
C. `980m//s^(2)`
D. `19.6m//s^(2)`

Answer

b

Explanation

`(g')/(g)=(GM)/(r^(2))(R^(2))/(GM)=(g')/(9.8)=(2M)/(M)xx(r^(2))/(4r^(2))=4.9`