Question

plzz answer...... ........ .... ... ... ... .. . .. . .

Answer 1

let radius of planet A be r and acc. due to gravity be g and mass beM

let radius of planet B be R and acc due to gravity be g' and mass be m

we know that R=2r

and g=2g'........1

g=GM/r^2

g'=Gm/R^2

put value of g and g' in 1

GM/r^2=2Gm/R^2

M/r^2=2m/(2r)^2

M/r^2=2m/4r^2

M=1/2m

therefore mass of planet B is twice the mass of planet A

hope this helps you