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Mr. Hoffman, a science teacher, drove 10 miles to school from home in 20 minutes. He drove the 10 miles home in 30 min. His average velocity was _____ m/s.

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AL2006
His average velocity for the day was 0. He ended where he started so his displacement was 0.
trevorhenyan51

zero.

Because he finished right where he started. his total displacement zero. therefore, his average velocity was also zero  

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