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JEE Mains · Physics · STD 11 - 2. motion in straight line

यदि \(t =\sqrt{ x }+4\), तो \(\left(\frac{ dx }{ dt }\right)_{ t =4}\) का मान है

  1. A \(4\)
  2. B \(0\)
  3. C \(8\)
  4. D \(16\)
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Answer & Solution

Correct Answer

(B) \(0\)

Step-by-step Solution

Detailed explanation

\(t =\sqrt{ x }+4\) \(\Rightarrow x =( t -4)^{2}= t ^{2}-8 t +16\) \(\Rightarrow \frac{ dx }{ dt }=2 t -8\) \(\left.\Rightarrow \frac{ dx }{ dt }\right|_{ t =4}=2 \times 4-8=0\)
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