Conservation of linear momentum states that an object retains total momentum and considered as isolated until and unless any external force acts on it. In other words, without the application of an external force, the body or an object will converse the momentum. It can be formulated as,

Conservation of Linear Momentum 1” = C

Since resultant force is zero,

21 = 0


2 =1 (This is the principle of conservation of linear momentum.)


Suppose two bodies collide with each other as shown in figure below.

Conservation of Linear Momentum 2” = C

If one body has +F and other body has –F, then the net force will be zero {(+F) + (–F) = 0}. Here, the linear momentum is conserved.

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