0.20 mm/s
0.08 mm/s
0.25 mm/s
0.05 mm/s
Correct answer is B
Given: dAdt=4mm2/s
dAdt=(dAdr)(drdt)
A=πr2⟹dAdr=2πr
⟹4=2πr×drdt
drdt=42πr=4×72×22×8
= 0.07954mm/s≊
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