Question

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Answer 1

Explanation:

in AB velocity decreases, in BC the velocity remains same and in CD velocity increases.

Answer 2

In v-t graph the slope i.e. dv/dt(tan theta) represents acceleration.So in part AB and CD the slope is a straight line ie. constant acc. and non uniform velocity.In BC slope or tan theta is 0 so acc. is 0 and thus velocity is constant for BC part of the journey.