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The diagram shows variation of \( \frac{1}{\mathrm{v}} \) with respect
\( \mathrm{P} \) to time (where \( v \) is in \( \mathrm{m} / \mathrm{s} \) ).

W
What is the instantaneous acceleration of body at \( \mathrm{t}=3 \sec \cdot\left(\operatorname{in} \frac{\mathrm{m}}{\mathrm{s}^{2}}\right) \) ?
(1) \( \frac{1}{3} \)
(2) 1
(3) \( \frac{2}{3} \)
(4) 3
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