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Question 4 Figure shows a cart used in an experiment to study the law of conservation of momentum. The flag is a rigid metal
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The law of conservation of momentum states that the momentum of a system is constant if there is no external force acting on the system.

Vernier caliper will be used to measure the accurate measurement of an object having length 5 to 6 cm as its least count is 0.1 mm.

Measuring tape and meter ruler may cause error.

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