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CUET · MATHS · PYQ PAPER 2023

A particle moves along the curve \(6 y=x^3+2\). The point(s) on the curve at which the \(y\)-coordinate is changing 8 times as fast as the \(x\)-coordinate are:

  1. A \((4,11)\) and \(\left(-4,-\frac{31}{3}\right)\)
  2. B \(\left(4,-\frac{31}{3}\right)\) and \((-4,11)\)
  3. C \((4,-4)\)
  4. D \(\left(11,-\frac{31}{3}\right)\)
Verified Solution

Answer & Solution

Correct Answer

(A) \((4,11)\) and \(\left(-4,-\frac{31}{3}\right)\)

Step-by-step Solution

Detailed explanation

\(6 \frac{dy}{dt} = 3x^2 \frac{dx}{dt}\) \(6 \left(8 \frac{dx}{dt}\right) = 3x^2 \frac{dx}{dt}\) \(48 = 3x^2\) \(x^2 = 16 \implies x = \pm 4\) For \(x=4\): \(6y = (4)^3+2 \implies 6y = 66 \implies y = 11\) For \(x=-4\):…
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