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Assume that a spherical rain drop evapor...

Assume that a spherical rain drop evaporates at a rate proportional to its surfaceradius originally is 3 mm and 1 hour later has been reduced to 2 mm, find an expression for the radius of the rain drop at any time.

A

2-t mm

B

2+t mm

C

3-t mm

D

3+t mm

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The correct Answer is:
C
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