If `vecA` is a vector of magnitude 5 units due east. What is the magnitude and direction of a vector `-5 vecA` ?

Options

A. 0
B. `pi//3`
C. `pi//2`
D. `pi//4`

Answer

C

Explanation

`vecA+vecB = vecC rArr A^(2) +B^(2) = C^(2)`
thus angle between `vecA and vecB ` is `90^(@)`.