The law of conservation of charge states that

the law of conservation of charge states that electric charge can neither be created nor destroyed.

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Explanation:

The law of conservation of charge states that the total electric charge in an isolated system never changes, or that electric charge can neither be created nor destroyed. Similar to the law of conservation of mass or the law of conservation of energy, it rules that there must be a sense of balance. Hope this helps! :)

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.