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## Homework Statement

By considering the gravitational potential energy of an object at the surface , find an expression for the escape speed from the surface and determine its value.

## Homework Equations

GPE= mgh

## The Attempt at a Solution

KE= 1/2* m * v^2

GPE= mgh

GPE+ KE = 0

mgh = - 1/2 * m * v^2

gh= - 1/2 * v^2

v^2= -2gh

v= sqare root of (-2gh)

this is the escape velocity...