Gravitational fields - move from A to infinity

[Denul]

Homework Statement

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 Files2. 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?

The Attempt at a Solution

 

[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?)

 

[berkeman]

Homework Statement

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?

The Attempt at a Solution

Welcome to the PF.

Please check your PMs. You *must* show some effort in your schoolwork questions here.