Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the problem of projectile motion in a medium with quadratic
  resistance   A classic problem of the motion of a projectile thrown at an angle to the
horizon in a medium with a quadratic resistance law is studied. An approximate
analytical solution of the equations of projectile motion is presented, which
has a high accuracy. The proposed formulas are universal, that is, they can be
used for any initial conditions of throwing over a wide range of the change of
medium resistance coefficient. The motion of a shuttlecock of badminton,
bullet, table tennis ball and volleyball are presented as examples.

8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat