# FHSST Physics/Collisions and Explosions/Summary

 Units Quantity Symbol Unit SI base units Direction velocity ${\displaystyle {\overrightarrow {v}}}$ -- ${\displaystyle {\frac {\mbox{m}}{\mbox{s}}}}$ or ${\displaystyle \ \ {\mbox{m}}\cdot {\mbox{s}}^{-1}}$ yes momentum ${\displaystyle {\overrightarrow {p}}}$ -- ${\displaystyle {\frac {{\mbox{kg}}\cdot {\mbox{m}}}{\mbox{s}}}}$ or ${\displaystyle \ \ {\mbox{kg}}\cdot {\mbox{m}}\cdot {\mbox{s}}^{-1}}$ yes energy E J ${\displaystyle {\frac {{\mbox{kg}}\cdot {\mbox{m}}^{2}}{{\mbox{s}}^{2}}}}$ or ${\displaystyle \ \ {\mbox{kg}}\cdot {\mbox{m}}^{2}\cdot {\mbox{s}}^{-2}}$ no
 ${\displaystyle {\begin{matrix}{\overrightarrow {p}}=m{\overrightarrow {v}}\end{matrix}}}$ (8.13)
 ${\displaystyle {\begin{matrix}E_{k}={\frac {1}{2}}m{\overrightarrow {v}}^{2}\end{matrix}}}$ (8.14)