[填空题]
Two bumper cars in an amuseyl 8j3kqbhz (u y2r(b3men n/9on7jlh md.w3bsdq*1 e z*lt park ride collide elastically as one approaches the o9 lbo.1q n3*leznsd*/7dmjwh ther directly from the rear (Fig. 7–34). Car A has a mass of 450 kg 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