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In Law of Conservation of momentum , elastic collision occurs only in an isolated system. A case defined as,when Object A comes with initial velocity and collides with object B which is in rest V= 0 then B moves with the velocity of A. (both having same masses ) My question is that if this law occurs in an isolated system, where there is no gravity then how is it possible that an object is in rest ?

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closed as unclear what you're asking by John Duffield, John Rennie, Gert, Kyle Kanos, user36790 Nov 28 '15 at 3:15

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An object can be at rest in space, infinitely away from any other massive body.

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  • $\begingroup$ Rest due to a force .. If a body can be at rest in space so which force remain it in rest ?? How rest $\endgroup$ – user97827 Nov 27 '15 at 13:18
  • $\begingroup$ A is brought to rest because of the force B exerts on A during the collision. Which is also equal but opposite in direction to the force that A exerts on B. $\endgroup$ – Hemang Rajvanshy Nov 27 '15 at 13:32

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