A vertical scale on a spring balance reads from 0 to 225., Ask an Expert

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Q. Two freight cars, each with a mass of 2.6 x10^5 kg, collide and stick together. One was initially moving at 2.8 m/s and the other was at rest. What is their final speed?

Q. A vertical scale on a spring balance reads from 0 to 225. The scale has the length of 11.5 from the 0 to 225 reading. A fish hanging from the bottom of the spring oscillates perpendicularly at a frequency of 3. Ignore the mass of the spring, what is the mass of the fish?

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