HELP! A man is at home and is on his way to work, which is 8 meters away. He travels 4 meters north at 3 m/s and travels south at 4m/s to his house because he forgets his keys. Then he travels north again at 6m/s and arrives at work. What is his average velocity?

the answer is d. 4

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b) phosphorus pentoxide

the answer would be c. motion and direction

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d. platinum would have the greatest temperature increase because it has the lowest specific heat.