Which of the following best describes the shape of a distance-time graph for an object moving at a uniform speed?
A straight line with a constant slope
On a distance-time graph, time is plotted along the horizontal axis and distance along the vertical axis, and the slope of the graph at any point gives the speed of the body.
When an object moves with uniform speed, it covers equal distances in equal intervals of time, so the ratio of distance to time stays the same throughout the motion.
This constant rate of change produces a straight line that rises steadily, that is, a straight line with a constant slope; a curved line would indicate changing speed, and a horizontal line would mean the body is at rest.
Hence, the correct answer is A straight line with a constant slope.
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