1.

If \(\rm |\vec{a}\times \vec{b}|^2 + |\vec{a}\cdot \vec{b}|^2=100\) and \(\rm |\vec{a}|=5\), then what is \(\rm |\vec{b}|\) equal to?

A. 3
B. 4
C. 2
D. None of these
Answer» D. None of these


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