Which consequence arises when Viking longships encounter substantial headwind?

💡 Explanation

Headwinds reduce sail effectiveness by decreasing the forward driving force; the Reaction Force from wind striking the sail is backward, therefore relying heavily on rowing because oar propulsion is less affected rather than benefiting from sail power.

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• Which mechanism contributed to Viking longships' sailing speeds given unpredictable arctic winds?
• Which outcome occurred when Roman legionaries used the 'vinea' siege weapon against fortified walls?
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