# Question #484de

##### 1 Answer

#### Answer:

If we rely on the posted correct answer, depth should be

#### Explanation:

Calculate gravitational force between body and mass of part sphere of earth which lies below 320 km. Force due to outer spherical shell tends to cancel out.

Mass of earth

where

mass of earth sphere below

Acceleration due to gravity at the location of body

Inserting value from (1) we get

We know that acceleration due to gravity at the surface in terms of equation (2)

Dividing (2) by (3) we get

Taking average radius of earth as

Weight of