- A When there is a net external force acting on a system of bodies
- B When there is no net external force acting on a system of bodies
- C When the velocity of the first body is higher than that of the second body
- D When two bodies collide in a straight line
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Answer:
B
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The principle of conservation of linear momentum holds true when there is no net external force acting on a system of bodies. This means that the total momentum of the system before an event (like a collision) is equal to the total momentum of the system after the event.
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