Slope in the first second: 20 m/s
Slope in the next second: 40 m/s
Average slope: 30 m/s
Explanation:
On a distance-time graph, the slope of the curve represents the speed of the object.
In fact, we have:
Speed is the ratio between distance and time, therefore
which corresponds to the slope of the line.
In this problem, we have a ball moving from 20 m to 40 m in 1 s, so
So the slope in the first second is
In the next second, the ball moves from 40 m to 80 m, so
So the slope in the next second is
While if we consider the overall graph in the 2 seconds, we have
So the average slope is
Learn more about speed:
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