"\\Delta \\overrightarrow{v}=\\overrightarrow{v}_P-\\overrightarrow{v}_Q"
"|\\Delta \\overrightarrow{v}|=\\sqrt{|\\overrightarrow{v}_P|^2+|\\overrightarrow{v}_Q|^2}"
"|\\Delta \\overrightarrow{v}|=\\sqrt{300^2+300^2}=424\\ m\/s"
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