If |A+B|=13, |A-B|=7 and |A|=|B|, find the magnitude of each vector.

Question

G1 Physics · Accepted Answer

Adding squares gives 169+49=2(A²+B²)=4A². Hence A²=109/2, so A=√(109/2)=√218/2. Options B and C are equivalent? Use √218/2 as unique correct.