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Q. Two 3.0 {rm g} point charges on 1.0-{rm m}-long threads repel each other after being equally charged. What is the charge q?

Q. A soccer player kicks a rock horizontally off a 35.0 m high cliff into a pool of water. If the player hears the sound of the splash 2.84 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.

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