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The diagonal of square is changing at th...

The diagonal of square is changing at the rate of `0.5 cms^(-1)`. Then the rate of change of area, when the area is `400 cm^(2)`, is equal to

A

`20sqrt2cm^2//sec`

B

`10sqrt2cm^2//sec`

C

`1/(10sqrt2)cm^2//sec`

D

`10/sqrt2cm^2//sec`

Text Solution

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The correct Answer is:
B
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