The acceleration will be positive in

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(I) and (III)

(I) and (IV)

(II) and (IV)

None of these

answer is B.

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Detailed Solution

In (I), slope is negative and its magnitude is decreasing with time. It means slope is increasing numerically. So velocity is increasing towards right, and so acceleration is positive. In (IV), slope is positive and its magnitude is increasing with time. So velocity is increasing towards right, and so acceleration is positive.

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