# Gravitational fields - move from A to infinity

1. Apr 21, 2014

### Denul

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 Files:

• ###### from A to infinity.jpg
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Last edited: Apr 21, 2014
2. Apr 21, 2014

### Simon Bridge

Welcome to PF;
As the object moves alng the marked trajectory, do the angles change?

But this is a red herring - ignore it.

Consider: gravity is a conservative force - what does this mean in terms of the work to go between two points?

What is the definition of gravitational potential energy?
(In terms of work and infinity?)

3. Apr 21, 2014

### Staff: Mentor

Welcome to the PF.