alleryIn a one-dimensional elastic collision between a moving body and an equal-mass stationary body, the moving body after collision:
AContinues with the same velocity
BStops completely
CRebounds with the same speed
DMoves with half its initial velocity
Answer & Solution
Correct answer: B. Stops completely
1. For equal masses in 1-D elastic collision, the standard result is total exchange of velocities.
2. The moving body transfers its entire KE and momentum to the stationary body.
3. Hence the moving body comes to rest; the other moves off with the original speed.
4. This is why a moving billiard ball stops dead on hitting a stationary identical ball head-on.
_Source: syllabus Physics Ch 5, §5.12 Elastic Collisions in One Dimension_
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