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At an instant the diagonal of a square ...

At an instant the diagonal of a square is increasing at the rate of 0.2 cm/sec and the area is increasing at the rate of `6 cm^(2)//sec`. At the moment its side, is

A

`(30)/(sqrt(2))cm`

B

`30sqrt(2)` cm

C

30 cm

D

15 cm

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The correct Answer is:
A
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