If two vectors `vec A_(1) = hati-3hati+5hatk and vecA_(2)=hati-3hatj+a hatk` are equal, then the value of a is

Options

A. `+5`
B. `-5`
C. `-3`
D. 2

Answer

B

Explanation

Since the two vectors are equal, `vec A_(1) =vec A_(2)`
`therefore` The coefficients of `hati, hatj and hatk` must be equal. `therefore a=-5`