State how the velocity-time graph can be used to find the distance travelled by the body in a given time.
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Solution
Distance travelled from velocity-time graph
The total distance travelled is the arithmetic sum of the area enclosed between velocity-time graph and time axis, without considering the direction of displacement. Here, the total distance travelled (between t= 0 s and t= 20 s) = Sum of areas = 30+10 = 40 m.