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## Homework Statement

Starting with Newton's law of gravitation, determine the height h one person has to go from the surface of Earth in order for the person's weight to be reduced to 1/5 of their weight at the surface of the Earth. The only information you are given is that the radius of the earth is 6400 km.

## Homework Equations

GM_e/r^2, r = R_e + h

## The Attempt at a Solution

i know that 4 times R_e at the center(of earth) is equal to 3 times R_e at the surface. im not sure how to find the height using Newton's Law.