If a and b are two unit vectors inclined to x-axis at angles 30° and 120° respectively, then |a + b| equals
A. \(\sqrt{\frac{2}{3}}\)
B. √2
C. √3
D. 2
Answer:D
If a and b are two unit vectors inclined to x-axis at angles 30° and 120° respectively, then |a + b| equals
A. \(\sqrt{\frac{2}{3}}\) B. √2 C. √3 D. 2