# 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 A_{AB}=m * ∫ * K dr = Δ E_{k}

Is there anyone who knows the solution?

**3. The attempt at a solution**

http://ift.tt/1h7viP1

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