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## Homework Statement

The weight of a 0.60 kg object at the surface of Planet V is 20 N. The radius of the planet is 4 x 10^6 m. Find the gravitational acceleration at a distance of 2 x 10^6 m from the surface of this planet.

a. 8.9 m/s2

b. 11 m/s2

c. 13 m/s2

d. 18 m/s2

## Homework Equations

F=ma

a=MG/r^2

## The Attempt at a Solution

I did

acceleration at surface=20N/.6kg=33.33m/s^2

acceleration at surface=MG/r^2

MG=33.33m/s^2*(4x10^6)^2

acceleration at a distance=MG/(r+d)^2

a at a distance=(33.33m/s^2*(4x10^6)^2)/(2x10^6+4x10^6)^2

a=14.8m/s^2 which is not in the options