Elastic Collisions (1D & 2D) — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Elastic Collisions (1D & 2D) MCQs with step-by-step solutions (2 questions). Part of Centre of Mass, Momentum & Collisions. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Elastic Collisions (1D & 2D) · easy · numerical
A moving ball strikes an identical stationary ball elastically but NOT head-on (oblique, smooth). The angle between their final velocities is:
A. 180°
B. 60°
C. 45°
D. 90° ✓ Correct
Solution: For equal masses in an oblique elastic collision the final velocities are perpendicular — a classic result provable from p and KE conservation.
Q2 — Elastic Collisions (1D & 2D) · medium · numerical
A 4 kg ball moving at 6 m/s collides elastically head-on with a 2 kg ball at rest. The 2 kg ball moves off at:
A. 4 m/s
B. 12 m/s
C. 8 m/s ✓ Correct
D. 6 m/s
Solution: v₂' = 2m₁u/(m₁+m₂) = (2×4×6)/6 = 8 m/s (the 4 kg ball continues at 2 m/s).