Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Impact cratering mechanics: A forward approach to predicting ejecta
  velocity distribution and transient crater radii
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
2
The categories of this paper are: math
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con