我来试试

Given:
Vg=40, Va=43, Vm=46, Vp=50, 7.5% difference
M1(5200 lb) is poor, M2(3200 lb) is good

Solution:
M1 以V=40 撞墙后完全停止，其Vi=40，Vf=0
delta P1=5200*40=208000，结果：poor

M2 以V=40 撞墙后完全停止，其Vi=40，Vf=0
delta P2=3200*40=128000，结果：good

如果以40对撞，完全非弹性碰撞（个人认为更接近实际情况）
M1*40+M2*(-40)=(M1+M2)*Vf
Vf=9.5

delta P1=5200*(40-9.5)=158600
result：
158600/208000=76%
decreased by 24%, from poor to good

delta P2=3200*(40+9.5)=158400
result：
158400/128000=1.23
increased by 23%, from good to poor