Let side of a square is changing at the rate of \( 2 \mathrm{~m} / ...

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Let side of a square is changing at the rate of \( 2 \mathrm{~m} / \mathrm{sec} \),
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then find the rate at which it's area is changing when
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area \( =1600 \mathrm{~m}^{2} \).
(1) \( 160 \mathrm{~m}^{2} / \mathrm{sec} \)
(2) \( 1600 \mathrm{~m}^{2} / \mathrm{sec} \)
(3) \( 80 \mathrm{~m}^{2} / \mathrm{sec} \)
(4) \( 40 \mathrm{~m}^{2} / \mathrm{sec} \)
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