Gravitational fields – move from A to infinity

1. The problem statement, all variables and given/known data

I have been trying solve this ask, but there is a problem. I don´t know how I can obtain an expression of infinity which is connected with angle.
Picture is as Attach Files

2. The attempt at a solution

I think, I must use this equations AAB=m * ∫ * K dr = Δ Ek

Is there anyone who knows the solution?

3. The attempt at a solution

Attached Images
File Type: jpg from A to infinity.jpg (62.6 KB)

http://ift.tt/1h7viP1

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