AP EAMCET · PHYSICS · Center of Mass Momentum and Collision
A steel ball of radius \(2 \mathrm{~cm}\) is at rest on a frictionless surface. Another steel ball of radius \(4 \mathrm{~cm}\) moving with velocity of \(81 \mathrm{cms}^{-1}\) collides elastically with the ball which is at rest. After collision the ball with radius of \(2 \mathrm{~cm}\) moves with speed of
- A \(144 \mathrm{~cm} \mathrm{~s}^{-1}\)
- B \(72 \mathrm{~cm} \mathrm{~s}^{-1}\)
- C \(216 \mathrm{~cm} \mathrm{~s}^{-1}\)
- D \(36 \mathrm{~cm} \mathrm{~s}^{-1}\)
Answer & Solution
Correct Answer
(A) \(144 \mathrm{~cm} \mathrm{~s}^{-1}\)
Step-by-step Solution
Detailed explanation
Radius of first steel ball, \[ r_1=2 \mathrm{~cm}=2 \times 10^{-2} \mathrm{~m} \] Radius of second steel ball, \[ r_2=4 \mathrm{~cm}=4 \times 10^{-2} \mathrm{~m} \] \(\therefore\) Mass of first steel ball,…
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