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On uniform heating, the side of a square...

On uniform heating, the side of a square sheet of metal is increasing at the rate of 0.02 cm/sec. The rate at which the area is increasing when the side is 10 cm long is :

A

`0.4cm^(2)//sec`

B

`0.2cm^(2)//sec`

C

`4.0cm^(2)//sec`

D

`40 cm^(2)//sec`.

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The correct Answer is:
A
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