Two identical 30 rm g particles each carry 3 rm mu c of, Ask an Expert

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Q. Two identical 30 {rm g} particles each carry 3 {rm mu C} of charge. One is held fixed, and the other is located 1 {rm mm} away and released. Find the speed of the moving charge when it's 1{rm cm} from the fixed charge.

Q. A 50m long train begins uniform acceleration from rest. The front of the train has a speed of 25m/s when it passes a railway worker who is standing 120m from where the front of the train started.

How do I make an equation for this so I can differentiate it?

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