0.75cm2S-1
0.53cm2S-1
0.35cm2S-1
0.88cm2S-1
Correct answer is D
A = πr2, δAδr = 2πr
So, using δAδt = δAδr x δAδt
= 2πr x 0.02
= 2π x 7 x 0.02
= 2 x 227 x 0.02
= 0.88cm2s-1
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