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一、选择题1.一物体沿直线运动,它的速度图象如图所示,由此可知A.2秒末物体返回出发点B.2秒末物体的运动方向发生改变C.第1秒和第3秒内物体的位移大小相等D.第1秒和第3秒内物体运动的加速度大小相等,方向相反2.物体从静止开始做匀加速直线运动,第3s内通过的位移是3m,则A.第3s内
First, multiple-choice questions 1. An object moves along a straight line. Its velocity image is shown in the figure. It can be seen that the object returns to the starting point at the end of A.2 seconds B.2 seconds at the end of the object’s direction of motion changes C. The first second sum The displacement of the objects in the 3rd second is equal. D. The acceleration of the objects in the 1st second and the 3rd second is equal, and the directions are reversed. 2. The object moves from a stationary position and performs uniform acceleration and linear motion. The displacement in the 3s is 3m. A. Within the 3s