MHT CET 2025 Mathematics question
The rate of change of volume of spherical balloon at any instant is directly proportional to its surface area. If initially its radius is 3 cm, after 2 minutes its radius becomes 9 cm, then radius of balloon after 4 minutes is
Answer: (C)
Solution
Given with and . Then , a constant: the radius grows linearly, . At : cm/min.
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