A point is moving on y=4-2x^(2). The x c...

A point is moving on `y=4-2x^(2)`. The x coordiante of the point is decreasing at the rate of 5 units per second. Then the rate at which y coordinate of the point is changing when the point is at (1,2) is

A

10 unit/sec

B

20 unit/sec

C

30 units/sec

D

40 units/sec

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The correct Answer is:

B

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