`vecA = 2 hati +3 hatJ +4 hatk` and `vecB =4 hati +5 hatj +3 hatk` , then the magnitudes of `vecA -vecB`…unit

Options

A. 21
B. 8.9
C. 3
D. 12.2

Answer

C

Explanation

`vec(A ) - vec(B ) = 2hat(I ) + 3hat(j ) + 4hat(k ) - 4hat(j ) - 5hat(j ) - 3hat(k )`
`|vec( A ) - vec( B ) = sqrt(-2)^(2) + (-2)^(2) + (1)^(2))`
`= sqrt(9)`
`=3`