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Question 30540
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Center of Mass, Momentum and Collision: Oblique Elastic — Equal Mass MCQ

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Oblique Elastic — Equal MassHardQuestion 30540

Question

Ball A (mass m, velocity v at 0°) strikes stationary ball B (mass m) obliquely at impact parameter b. After elastic collision, the angle between their velocities is:
  1. A
    45°
  2. B
    90°
    Correct
  3. C
    60°
  4. D
    180°

Correct answer

90°

Explanation

For elastic collision between equal masses (one at rest), the two masses always move at 90° to each other after the collision (derived from conservation of both momentum and KE).

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