AP EAMCET · PHYSICS · Center of Mass Momentum and Collision

A rocket with an initial mass \(m_0\) is going up with a constant acceleration \(a\) by exhausting gases with a velocity \(v\) relative to the rocket motion, then the mass of the rocket at any instant of time is (assume that no other forces act on it)

A \(m=m_0 e^{-\frac{a t}{v}}\)
B \(m=m_{\mathrm{e}} e^{-\frac{2 a t}{v}}\)
C \(m=m_0 e^{-\frac{\text { af }}{2 v}}\)
D \(m=m_0 e^{-\frac{a^2 t^2}{v^2}}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(m=m_0 e^{-\frac{a t}{v}}\)

Step-by-step Solution

Detailed explanation

For a rocket, \[ m \frac{d v}{d t}=F_{\text {ext }}+v \frac{d m}{d t} \] Without any external force \(\left(F_{\text {ext }}=0\right)\),…

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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