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A person moves 10 m, 30° east of north from his home. What is the minimum magnitude (in meters) of the next displacement that would make him reach some distance north of his home?

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answer is A.

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Detailed Solution

He has to reach some where north from his home. That means the tip of next displacement should be on the line towards north from his home. It will be minimum, if it is perpendicular on y-axis.

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