[填空题]
The gravitational sl5ue49yq uc*s+d 3s tdoingshot effect. xetq)re6m .6 lqx7cx2Figure 7–47 shows the planet Saturn moving in the negative x dic6q.rx7lq ee mt2x) 6xrection at its orbital speed (with respect to the Sun) of 9.6km/s The mass of Saturn is $5.69 \times10^{ 26}$kg A spacecraft with mass 825 kg approaches Saturn. When far from Saturn, it moves in the direction at 10.4km/s The gravitational attraction of Saturn (a conservative force) acting on the spacecraft causes it to swing around the planet (orbit shown as dashed line) and head off in the opposite direction. Estimate the final speed of the spacecraft after it is far enough away to be considered free of Saturn’s gravitational pull. km/s
