The law of conservation of momentum for a closed system in a collision process is applicable at:

a time,long after the collision has taken place only

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a time,long before the collision has taken place only

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both (a) and (b) as above

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all times of interaction

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Solution

The correct option is D all times of interaction
In the absence of external force, momentum of the closed system is conserved.

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Q. The law of conservation of momentum can be applied perfectly to the collision between two particles if the time of collision is:

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The amount of energy loss during collision, if at all, is indeed dependent on the nature of colliding objects. The energy loss is observed to be maximum when objects stick together after collision. The terminology is to define collision as 'elastic' if no energy loss takes place and to define collision as 'plastic' for maximum energy loss. The behaviour of system after collision depends on the position of colliding objects as well. A unidirectional motion of colliding objects before collision can turn into two dimensional after collision if the line joining the centre of mass of the two colliding objects is not parallel to the direction of velocity of each particle before collision. Such type of collision is referred to as oblique collision which may be either two or three dimensional.

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The law of conservation of momentum for a closed system in a collision process is applicable at:

The correct option is D all times of interactionIn the absence of external force, momentum of the closed system is conserved.

The correct option is D all times of interaction
In the absence of external force, momentum of the closed system is conserved.