Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Projectile motion: the "coming and going" phenomenon   An interesting phenomenon that occurs in projectile motion, the "coming and
going", is analyzed considering linear air resistance force. By performing both
approximate and numerical analysis, it is showed how a determined critical
angle and an interesting geometrical property of projectiles can change due to
variation on the linear air resistance coefficient.

27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math