Impact Energy

Impact Energy Formula
$E_i \;=\; \frac{1}{2} \cdot m \cdot v^2$ $m \;=\; \dfrac{ 2 \cdot E_i }{ v^2 }$ $v \;=\; \sqrt{ \dfrac{ 2 \cdot E_i }{ m } }$
Symbol	English	Metric
$E_i$ = Impact Energy	$lbf-ft$	$J$
$m$ = Mass	$lbm$	$kg$
$v$ = Velocity	$ft\;/\;sec$	$m\;/\;s$

Impact energy is the amount of energy required to fracture or break a material under a sudden applied force or load. It is used in materials science and engineering to assess a material's toughness, its ability to absorb energy and resist breaking when subjected to rapid stress, such as a collision or blow.