The principle of conservation of linear momentum states that in a system it

can not be changed

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can not be changed, if only internal forces act on it

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can be changed, if internal forces act on it

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none of these

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Solution

The correct option is B
can not be changed, if only internal forces act on it

Explanation for correct answer
(B)
The principle of conservation of linear momentum states that if in any assigned direction the net external force on a system is zero, then the linear momentum of the system will remain constant.
Hence correct answer is (B)

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