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The velocity-time graph of a body is shown in fig. The ratio of average acceleration during the intervals OA and AB is [add image]
Explanation
During OA, acceleration = $\tan 30^{\circ} = 1/\sqrt{3} m/s^{2}$ During AB, acceleration = $-\tan 60^{\circ} = -\sqrt{3} m/s^{2}$ Required ratio = $(1/\sqrt{3})/\sqrt{3} = 1/3$