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For the following velocity-time graph, the average speed for the motion during first 80 seconds is

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0.25m/s

5 m/s

10m/s

answer is B.

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Detailed Solution

Total displacement in 80s is zero, where as total distance travelled is sum of the magnitudes of areas under the curve for 0 to 40s and 40s to 80s.

Total distance = 1/2 x 40 x 10 + 1/2 x 40 x 10

= 400m

Average speed = 400m/80s

= 5m/s

The average velocity is zero.

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