Question

Calculate the acceleration due to gravity on the surface of planet whose mass and radius are double than the mass and radius of the earth

Answer 1

Use formula
g=GM/R square

Here M=2M
R is 2R
Now
g'=G2M/4Rsquare
g'=1/2g

Hope you get your answer.

Answer 2

Answer:

Here, m = 2M

r = 2R

We know, g = Gm/r²

g’ = G×2M/(2R)²

g’ = G×M/2R² = 1/2g = 1/2 × 9.8 = 4.9m/s²