Physics - Center of Mass Question with Solution | TestHub
PhysicsCenter of MassMomentum conservationMedium3 minQB
PhysicsMediummultiple choice
5 elastic balls A,B, C, D and E of same mass are moving on a frictionless horizontal wire. A graph is drawn for their position x against time (A from, B from 3 m, C from 2 m, D from 1 m, E from 0; A and B move in -x, D and E in +x, C at rest). Select the CORRECT statement(s) on basis of graph :
Options:(select one or more)
Answer:
A, B
Solution:
Identical elastic balls exchange velocities at each collision, so balls keep their left-right order and finally carry the sorted velocities. Slopes from the graph:. Every pair's lines cross once: collisions - (A) true. Final velocities sorted along the wire: E gets -2.5, D gets, C gets 0, B gets, A gets (B) true; C ends at 0 and D at, so (C), (D) false. Answer: (A), (B)
Stream:JEESubject:PhysicsTopic:Center of MassSubtopic:Momentum conservation
⏱ 3mℹ️ Source: QB
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