[填空题]
Two bumper cars in an amujr4z hser,xo /;d /o/asement park ride collide elastically as ongzd1nj + x0 uyna/n7(ne approaches the other directly from the rear (Fig. 7–34). Car A has a mass of 450 k naun nzx7j(d+ n10y/gg and car B 550 kg, owing to differences in passenger mass. If car A approaches at 4.5m/s and car B is moving at 3.7m/s calculate
(a) their velocities after the collision v'$_A$ = m/s v'$_B$ = m/s
(b) the change in momentum of each.$\Delta p_{\mathrm{A}}$$\approx$ kg*m/s $\Delta p_{\mathrm{B}}$$\approx$ kg*m/s