分析本问题中的C选项---**Question Number:** 3. (多选) **Question Stem:** 如图甲所示，在光滑水平面上两个物块A与B由弹簧连接(弹簧与A、B不分开)。初始时弹簧被压缩，同时由静止开始释放A、B，此后A的v-t图像如图乙所示(规定向右为正方向)。已知 m_A=0.1 kg, m_B=0.2 kg,弹簧质量不计。A、B及弹簧在运动过程中，在A物块速度为 1 m/s 时，则 **Options:** A. 物块 B 的速度大小为 0.5 m/s,方向向右 B. A 物块加速度是 B 物块加速度的 2 倍 C. 此时弹簧的弹性势能为 0.225 J **Chart Description - 图甲 (Figure Jia):** * **Type:** Schematic diagram illustrating a physical setup. * **Main Elements:** * A horizontal surface is depicted by a flat line with zig-zag markings underneath, indicating a smooth (frictionless) plane. * Two rectangular blocks, labeled 'A' (on the left) and 'B' (on the right), are placed on this surface. * A coiled spring is positioned horizontally between Block A and Block B, connecting them. The spring appears to be in a compressed state. * The diagram is labeled "甲" at the bottom center. **Chart Description - 图乙 (Figure Yi):** * **Type:** Velocity-time (v-t) graph. * **Main Elements:** * **Coordinate Axes:** * The horizontal axis represents time, labeled "t/s" (time in seconds). It starts from 0 at the origin and extends to the right. * The vertical axis represents velocity, labeled "v/(m·s⁻¹)" (velocity in meters per second). It originates from 0 and extends upwards for positive velocities and downwards for negative velocities. * The vertical axis has numerical labels: -4, -2, 0, 2, 4. Each major grid line represents a change of 1 m/s on the velocity axis. * The horizontal axis has grid lines, but specific time values are not numerically labeled, though the grid can be used to infer time intervals. * **Data Curve:** A smooth, sinusoidal wave representing the velocity of block A as a function of time. * The curve starts at v=0 at t=0. * It initially decreases to a minimum velocity of -2 m/s (at approximately t=0.5 s). * It then increases, passing through v=0 (at t=1 s). * It reaches a maximum velocity of 2 m/s (at approximately t=1.5 s). * It then decreases, passing through v=0 (at t=2 s), completing one full cycle. * The amplitude of the velocity (maximum speed) is 2 m/s. * The period of oscillation is 2 seconds (T = 2 s). * The graph is labeled "乙" at the bottom center.