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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

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

B

`(10)/(sqrt(2))cm^(2)//sec`

C

`20sqrt(2)cm^(2)//sec`

D

`10sqrt(2) cm^(2)//sec`

Text Solution

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The correct Answer is:
D
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