Question

самостоятельноя работа 3,4 номера

Answer 1

1. $m_{1}*v_{1}+m_{2}*v_{2}=(m_{1}+m_{2})*v$

$v= frac{m_{1}*v_{1}+m_{2}*v_{2}}{m_{1}+m_{2}}$

$v= frac{400}{120} =3,3m/s$

2. $m_{1}*v_{1}+m_{2}*v_{2}=0$

$v_{2}= frac{m_{1}*v_{1}}{m_{2}} =0,8m/s$