Which of the following distance time graph (x - t) represents one- dimensional uniform motion?

1. The question asks which distance-time graph (x-t) represents one-dimensional uniform motion. 2. Uniform motion means constant velocity. 3. In a distance-time graph, the slope represents velocity (velocity = change in distance / change in time). 4. Constant velocity implies a constant slope, which corresponds to a straight line on the x-t graph. 5. Graph (a) shows distance increasing linearly with time, indicating a constant positive slope, hence constant velocity (uniform motion). Graph (b) shows increasing slope (acceleration). Graph (c) shows constant distance (at rest). Graph (d) shows decreasing slope (deceleration). 6. Therefore, graph (a) represents one-dimensional uniform motion.