ঘাত বলের ক্ষেত্রে প্রযোজ্য-

$m_{1} v_{1 i}+m_{2} v_{1 i}=\left(m_{1}+m_{2}\right) v_{f}$

$m_{2} v_{11}+m_{1} v_{2 i}=\left(m_{1}+m_{2}\right) v_{f}$

$m_{1} v_{11}+m_{2} v_{2 i}=\left(m_{1}+m_{2}\right) v_{f}$

$m_{1} v_{21}+m_{1} v_{11}=\left(m_{1}+m_{2}\right) v_{f}$