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1从一道统考题谈起题目.如图1所示,AB路面是水平的,BCD路面是拱起的圆弧,其半径R=10m,圆弧的最高点C比AB段路面高出h=1.25m.已知一辆电动玩具车的质量m=3kg,额定输出功率为P=20W.该玩具车自A点以额定输出功率由静止开始运动,经12s时间到达C点时恰好对地面压力为0.(不计玩具车经过B点时的能量损失,g取10m/
1 From a test questions topic.As shown in Figure 1, AB pavement is horizontal, BCD pavement arc is arched, and its radius R = 10m, arc highest point C above the AB section of the road surface h = 1.25m. It is known that the mass of an electric toy car is m = 3kg and the rated output power is P = 20 W. The toy car starts from rest with rated output power from point A and arrives at point C just after 12 seconds Is 0. (Excluding toy cars when the energy loss through the B point, g take 10m /