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题目.(2011年江苏高考预测卷)如图1所示的“S”字形玩具轨道,该轨道是用内壁光滑的薄壁细圆管弯成,固定在竖直平面内,轨道弯曲部分是由两个半径相等半圆连接而成,圆半径比细管内径大得多,轨道底端与水平地面相切,弹射装置将一个小球(可视为质点)从a点水平弹射向b点并进入轨道,经过轨道后从p点水平抛出,已知小物体与地面ab段间的动摩擦
(2011 Jiangsu college entrance examination prediction volume) as shown in Figure 1 “S ” shaped toy track, the track is thin wall with a smooth thin tube rounded, fixed in the vertical plane, the curved part of the track Is formed by connecting two semicircles with equal radii. The radius of the circle is much larger than the inner diameter of the thin tube. The bottom of the trajectory is tangent to the horizontal ground. The ejector ejects a pellet (which can be regarded as a mass point) horizontally from point a to point b And into the orbit, thrown from the p point after passing through the track, it is known that the dynamic friction between the small object and the ground ab