Question

multiple choice question
how is constant speed shown on a distance - time graph?

○ a straight line

○ a line that curves up

○ a line that curves down

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Explanation:

In a distance - time graph, speed is calculated as the slope of the line (since speed = $\frac{\text{distance}}{\text{time}}$). For constant speed, the slope must be constant. A straight line has a constant slope, while a curved line (either curving up or down) has a changing slope, which would represent a changing speed (acceleration or deceleration). So constant speed is shown as a straight line on a distance - time graph.

Answer:

a. a straight line