Question

An object is moving in a straight line at a constant velocity.

On a speed-time graph, how is the line displayed?


A. negative slope

B. horizontally

C. positive slope

D. vertically

Answer 1

The speed is constant, and in your case the speed is the y coordinate of the graph.

So, you want to draw a graph where x grows (i.e. the time passes) and y remains constant (i.e. the speed remains constant).

A graph like this is a horizontal line, because you can never move up or down. More formally, all points of the form
`(x, y_0)`, where x changes and
`y_0` is constant, represent the horizontal line
`y=y_0`

Answer 2

An object is moving in a straight line at a constant velocity.

On a speed-time graph, how is the line displayed?

A. negative slope

B. horizontally

C. positive slope

D. vertically

Step-by-step explanation:

When something is constant, it means it's moving at the same speed so it must be a straight line.