If \(\vec{a} \cdot \vec{b}=-|\vec{a}||\vec{b}|\) then the angle between a and b is : (1)
A. 180°
B. 60°
C. 45°
D. 90°
Answer:A
If \(\vec{a} \cdot \vec{b}=-|\vec{a}||\vec{b}|\) then the angle between a and b is : (1)
A. 180° B. 60° C. 45° D. 90°