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
In an elastic collision, the kinetic energy is conserved. The velocity of bob B after the collision can be calculated using conservation of momentum and energy. The height h can be found using the formula h = v²/(2g), where v is the velocity of bob B after the collision.
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