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For a spherical balloon, the rate of change of
P radius with respect to time is \( 2 / \pi \mathrm{cm} / \mathrm{s} \) Find the

W
rate of change of volume, when radius is \( \frac{1}{2} \mathrm{~cm} \).
(1) \( 1 \mathrm{~cm}^{3} / \mathrm{s} \)
(2) \( 2 \mathrm{~cm}^{3} / \mathrm{s} \)
(3) \( 3 \mathrm{~cm}^{3} / \mathrm{s} \)
(4) \( 4 \mathrm{~cm}^{3} / \mathrm{s} \)
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