COMEDK · Physics · 3. Motion In One Dimension

A particle moves along a parabolic path \(y = 9x^2\) in such a way that the x component of velocity remains constant. If, the acceleration of the particle is \(2j\ ms^{-2}\), find the x component of velocity.

A \(\dfrac{1}{9}\ ms^{-1}\)
B \(\dfrac{1}{6}\ ms^{-1}\)
C \(\dfrac{1}{3}\ ms^{-1}\)
D \(\dfrac{1}{4}\ ms^{-1}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\dfrac{1}{3}\ ms^{-1}\)

Step-by-step Solution

Detailed explanation

The equation of the path is given by \(y = 9x^2\). Differentiating with respect to time \(t\), we get the y-component of velocity: \(v_y = \dfrac{dy}{dt} = 18x \dfrac{dx}{dt} = 18x v_x\) Differentiating again with respect to time \(t\), we get the y-component of acceleration:…

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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