Conservation of Linear Momentum — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Conservation of Linear Momentum 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 — Conservation of Linear Momentum · easy · numerical
A 100 kg gun fires a 1 kg shell at 200 m/s. The gun's recoil speed is:
A. 2 m/s ✓ Correct
B. 20 m/s
C. 0.2 m/s
D. 4 m/s
Solution: v = 1×200/100 = 2 m/s.
Q2 — Conservation of Linear Momentum · medium · numerical
A 50 kg girl standing on a 150 kg stationary raft (calm water) walks at 2 m/s relative to the WATER. The raft moves at:
A. 1.5 m/s
B. 0.5 m/s
C. 2/3 m/s opposite to her ✓ Correct
D. 2 m/s
Solution: 50×2 = 150×v ⇒ v = 2/3 m/s backwards (total momentum stays zero).