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Arrow trajectory calculation

on Wed Mar 18, 2015 8:45 pm
Help Board. I have an object arrow, which consists of 3 parts (rigidbody):
tip, shaft, tail. Movement arrow I give impulse, AddForce to the tip as he had mass, while the tail have a resistance ,Drag.

What is the question: how can you make (one):
1 - Pre-flight trajectory
2 - Pre-hit area of the boom.

Since the arrow composite is the resistance Drag I do not know how to calculate the trajectory in physical formulas.

Thanks in advance.
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