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JEE Main 2005 Mathematics question

MathematicsApplication of DerivativesJEE Main 2005

A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness than melts at a rate of 50 /min. When the thickness of ice is 5 cm, then the rate at which the thickness of ice decreases, is

Answer: (2)

Solution

Outer radius ; , . At , :

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Question ID VK-038710