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Velocity-time (v-t) graph for a moving object is shown in the figure. Total displacement of the object during the time interval when there is non-zero acceleration and retardation is

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Answer is (B)

Between time interval 20 sec to 40 sec, there is non-zero acceleration and retardation. 

Hence distance travelled during this interval = Area between time interval 20 sec to 40 sec 

= 1/2×20×3+20×1

 = 30 + 20 = 50 m.

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