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## Homework Statement

## Homework Equations

energy conservation

## The Attempt at a Solution

I used this equation:

1/2 mg R^2/ r1 + 1/2 mv

_{1}^2 = 1/2 mg R^2/ r2 + 1/2 mv

_{2}^2

For r1, it is 1738 km (radius) + 1000 km (above surface) ?

But for r2 , it is on the surface, so would it be 0??