Find the rate of change of the area of a square per second with respect to its edge ' \( a \) ' ....

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Find the rate of change of the area of a square per
\( \mathrm{P} \)
second with respect to its edge ' \( a \) ' when \( a=10 \mathrm{~cm} \).
(1) \( 5 \mathrm{~cm}^{2} / \mathrm{s} \)
(2) \( 10 \mathrm{~cm}^{2} / \mathrm{s} \)
(3) \( 20 \mathrm{~cm}^{2} / \mathrm{s} \)
(4) None of these


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