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:

1. A. 8
2. B. 7
3. C. 5
4. D. 2.5

Attempt this NEET 2026-reneet Physics question free — pick an option to reveal the correct answer and a step-by-step explanation. Then join NEET Mastery Quest to practise 15,000+ PYQ and 2027-syllabus questions.