Inelastic & Perfectly Inelastic Collisions — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Inelastic & Perfectly Inelastic Collisions MCQs with step-by-step solutions (2 questions). Part of Centre of Mass, Momentum & Collisions. Practise online on Prepizo — no login needed.
▶ Practise Inelastic & Perfectly Inelastic Collisions online (free)
Questions with solutions
Q1 — Inelastic & Perfectly Inelastic Collisions · easy · numerical
A 3 kg lump of clay at 4 m/s hits a 1 kg block at rest and sticks. The common speed is:
A. 3 m/s ✓ Correct
B. 2 m/s
C. 1 m/s
D. 4 m/s
Solution: v = 12/4 = 3 m/s.
Q2 — Inelastic & Perfectly Inelastic Collisions · medium · numerical
In a perfectly inelastic head-on collision of equal masses (one at rest), the fraction of the initial KE lost is:
A. 1/2 ✓ Correct
B. All of it
C. 1/3
D. 1/4
Solution: v' = u/2 ⇒ KE_f = ½(2m)(u/2)² = mu²/4, while KE_i = mu²/2. So exactly half the kinetic energy is lost.