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Centre of Mass, Linear Momentum, Collision — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsCentre of Mass, Linear Momentum, Collision2 Marks
Question
In a head-on collision between two particles, is it necessary that the particles will acquire a common velocity at least for one instant?
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Answer

It is not necessary that in a head on collision the particles would acquire same initial velocity it is possible in elastic collision but it is not necessary.

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