| Exam Board | CAIE |
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| Module | P1 (Pure Mathematics 1) |
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| Year | 2011 |
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| Session | June |
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| Topic | Non-constant acceleration |
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2 The volume of a spherical balloon is increasing at a constant rate of \(50 \mathrm {~cm} ^ { 3 }\) per second. Find the rate of increase of the radius when the radius is 10 cm . [Volume of a sphere \(= \frac { 4 } { 3 } \pi r ^ { 3 }\).]