RE-NEET 2026 Physics Collisions MCQ Question
Bob B of mass m at rest is hanging vertically from the ceiling via a massless string of length 10 m, as shown in the figure. Point mass A of mass m travelling horizontally with speed 10 ms⁻¹ hits bob B elastically. The bob B rises h meter after the collision. Taking the acceleration due to gravity g = 10 ms⁻² and neglecting the size of the bob, the value of h is:
7
5
2.5
8
Correct Answer
Detailed Explanation
✅ Ans: 2.5 m
Key Concept: First find the velocity of bob B after collision, then apply K.E. → P.E.
❌ Why other options are wrong?
- 7 m ❌ → incorrect post-collision velocity used
- 5 m ❌ → assumes after collision
- 8 m ❌ → incorrect energy conversion
📌 NCERT: “In an isolated system, total momentum remains conserved.”
🧠 NEET Trap: Collision first → find velocity → then use K.E. = P.E.
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