plz explain the graph

Dear Student,
Total displacement between t = 0 to 6 s is 0. Hence, the average velocity between t = 0 to 6 s will be total displacement / time = 0m/s

The instantaneous velocity at t = 3 s will be the slope of the x-t curve at t = 3, which is 0.
Hence , ans is (0; 0)

Regards

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