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What does si stand for,when referring to a system of measurement

The height of the empire state building is 318 m if a stone is dropped from the top of the building what is the stones velocity just before it strikes the ground

Paul and ivan are riding a tandem bike together. they’re moving at a speed of 5 meters/second. paul and ivan each have a mass of 50 kilograms. what can paul do to increase the bike’s kinetic energy?