解答这个问题并尝试拓展讲解---Extraction Content: Question Stem: 1. 一物体做直线运动，其加速度随时间变化的 a-t 图像如图所示。下列 v-t 图像中，可能正确描述此物体运动的是 ( ) Chart Description (a-t graph): * Type: Line chart (specifically, piecewise constant function graph). * Coordinate Axes: * Horizontal axis: labeled 't', representing time. Starts at 0 and goes to the right. Marked points are T/2, T, 3T/2, 2T. * Vertical axis: labeled 'a', representing acceleration. Origin is at 0. Positive direction is upwards, negative direction is downwards. Marked points are a0 and -a0. * Data Series: * From t=0 to t=T/2 (exclusive of T/2): The graph is a horizontal line segment at a = a0. Represented by a solid line from (0, a0) to (T/2, a0), with a dashed vertical line down at T/2. * From t=T/2 to t=2T (inclusive of 2T): The graph is a horizontal line segment at a = -a0. Represented by a solid line from (T/2, -a0) to (2T, -a0). Dashed vertical lines are shown at T/2, 3T/2, and 2T extending to this horizontal line. Options (v-t graphs): The options are presented as four separate v-t graphs labeled A, B, C, and D. Each is a line chart showing velocity v as a function of time t. Option A Chart Description: * Type: Line chart (piecewise linear graph). * Coordinate Axes: * Horizontal axis: labeled 't'. Marked points are T/2, T, 3T/2, 2T. Starts at 0. * Vertical axis: labeled 'v'. Marked points are v0, 0, -v0. Origin at 0. * Data Series: * Starts at (0, 0). * Linear segment from (0, 0) to (T/2, -v0). * Horizontal segment from (T/2, -v0) to (3T/2, -v0). * Linear segment from (3T/2, -v0) to (2T, a value above 0, approximately v0/2). Option B Chart Description: * Type: Line chart (piecewise linear graph). * Coordinate Axes: * Horizontal axis: labeled 't'. Marked points are T/2, T, 3T/2, 2T. Starts at 0. * Vertical axis: labeled 'v'. Marked points are v0, 0, -v0. Origin at 0. * Data Series: * Starts at (0, v0). * Linear segment from (0, v0) to (T/2, 0). * Horizontal segment from (T/2, 0) to (3T/2, 0). * Linear segment from (3T/2, 0) to (2T, v0). Option C Chart Description: * Type: Line chart (piecewise linear graph). * Coordinate Axes: * Horizontal axis: labeled 't'. Marked points are T/2, T, 3T/2, 2T. Starts at 0. * Vertical axis: labeled 'v'. Marked points are v0, 0, -v0. Origin at 0. * Data Series: * Starts at (0, 0). * Linear segment from (0, 0) to (T/2, v0). * Horizontal segment from (T/2, v0) to (T, v0). * Linear segment from (T, v0) to (3T/2, 0). * Linear segment from (3T/2, 0) to (2T, -v0). Option D Chart Description: * Type: Line chart (piecewise linear graph). * Coordinate Axes: * Horizontal axis: labeled 't'. Marked points are T/2, T, 3T/2, 2T. Starts at 0. * Vertical axis: labeled 'v'. Marked points are v0, 0, -v0. Origin at 0. * Data Series: * Starts at (0, 0). * Linear segment from (0, 0) to (T/2, v0). * Horizontal segment from (T/2, v0) to (T, v0). * Linear segment from (T, v0) to (2T, -v0). (The point at 3T/2 is on this segment, where v=0).