\(10\,g\) નું વજન ધરાવતો કણ સુરેખ રેખામાં \(2 x\) પ્રતિપ્રવેગ સાથે ગતિ કરે છે, જ્યાં \(x\) એ \(SI\) એકમમાં સ્થાનાંતર છે. ઉપરના સ્થાનાંતર માટે ગતિઊર્જામાં થતો ધટાડો \(\left(\frac{10}{x}\right)^{-n}\,J\) છે. \(n\)ની કિંમત .......... હશે.

A \(1\)
B \(3\)
C \(4\)
D \(2\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(2\)

Step-by-step Solution

Detailed explanation

Loss of K.E = work done against retarding force . \(=\int \limits _0^{ x } madx =\int \limits_0^{ x } m 2 xdx = mx ^2\) \(=\left(10^{-2} kg \right) x ^2 J =\left(\frac{10}{ x }\right)^{-2}\,J\) So \(n=2\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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