alleryA UNIT VECTOR in the direction of v = 3i + 4j is:
A$(3i + 4j)/5$
B$(3i + 4j)/7$
C$3i + 4j$ itself
D$5(3i + 4j)$
Answer & Solution
Correct answer: A. $(3i + 4j)/5$
|v| = √(9+16) = √25 = 5. Unit vector v̂ = v/|v| = (3i + 4j)/5 = (0.6)i + (0.8)j.
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