August 3, 20654381day, Liangshan Prefecture, Sichuan Province suffered a flood disaster, and the local armed police detachment actively organized flood fighting and rescue. As shown in the figure, during the flood fighting, According to l=H-2t2, B rises at a uniform acceleration in the vertical direction, and the tension in the suspension cable is greater than gravity, that is, the line segment representing the tension F is longer than the line segment representing the gravity G, and the plane moves at a uniform speed in the horizontal direction, so both F and G are in the vertical direction; When accelerating upward, the trajectory should be deflected upward, and only A conforms to it, so the force and trajectory of A to the wounded B during this period are correct.

So choose: a.