How to find the maximum angle for a projectile thrown from a point P?

[Lando]

A projectile is thrown from a point P. It moves in such a way that its distance from P is always increasing. Find the maximum angle above the horizontal with which the projectile could have been thrown. You can ignore air resistance.

Please explain to me the ways to solve this. Thanks

 

[Evo]

Welcome Lando,

This is the new member introductions forum. Please post your question in the appropriate homework forum. Here is a link on how to post there. https://www.physicsforums.com/threads/guidelines-for-students-and-helpers.686781/