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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

For a system to follow the law of conservation of linear momentum during a collision, the condition is (1) Total external force acting on the system is zero. (2) Total external force acting on the system is finite and the time of collision is negligible. (3) Total internal force acting on the system is zero.

Answer: (D)

Solution

Momentum is exactly conserved when the net external force is zero (condition 1); it is also approximately (and, in the idealised collision limit,

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Question ID VK-153664