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Mary slides down a snow-covered hill on a large piece of cardboard and then slides across a frozen pond at a constant velocity of 2.4 m/s. After Mary has reached the bottom of the hill and is sliding across the ice, Sue runs after her at a velocity of 4.4 m/s and hops on the cardboard. How fast (in m/s) do the two of them slide across the ice together on the cardboard
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Mary slides down a snow-covered hill on a large piece of cardboard and then slides across a frozen p...
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