The law of conservation of momentum is stated for closed and isolated system. What are the two conditions for a system to be closed and isolated?

a

No external force acts on the system and there is no change in mass of the system.

b

No external force acts on the system and there is a gain in mass.

c

No external force acts on the system and there is a loss in mass.

d

An external force acts on the system and there is no change in mass.

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