CUET · MATHS · PYQ PAPER 2023
An edge of a variable cube is increasing at the rate of 3 cm/s. How fast is the volume of the cube increasing when the edge is 10 cm long?
- A \(100 cm^3 / s\)
- B \(300 cm^3 / s\)
- C \(900 cm^3 / s\)
- D \(600 cm^3 / s\)
Answer & Solution
Correct Answer
(C) \(900 cm^3 / s\)
Step-by-step Solution
Detailed explanation
\(V = s^3\) \(\frac{dV}{dt} = 3s^2 \frac{ds}{dt}\) \(\frac{dV}{dt} = 3(10)^2 (3)\) \(\frac{dV}{dt} = 900 \text{ cm}^3\text{/s}\)
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