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A particle starts from rest and undergoe...

A particle starts from rest and undergoes an acceleration as shown in figure. The velocity-time graph from figure will have a shape.

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The correct Answer is:
A
Till `t = 2 s`, there is constant acceleration `a m//s^2` and after that there is constant deceleration `- a m//s` same magnitude. So velocity first increases from `0` to maximum and finally becomes zero.
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