Three boxes are lined up so that they are touching each other on a nearly frictionless plane. Box A has a mass of ?A=19.0 kg, box B has a mass of ?B=30.5 kg, and box C has a mass of ?C=53.0 kg. An external force ?⃗ pushes on box A toward the right, and the force that box B exerts on box C has a magnitude of 194 N. Ignore friction.

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One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.