Question

The mass and radius of a planet are double of those of earth what will be the gravity.Calculate the gravity.​

Answer 1

Answer:

Given that,

Mass of the earth =M

Radius of the earth = R

We know that,

g=R2GM

Now, mass and radius is double

  g′=4R2G2M

 g′=2R2GM

 g′=21g

Hence, the acceleration due to gravity on the surface of a planet is 21g