Question

if a unit vector Is represented by 0.5i^-0.8j^+ck^alue of 'c'is?

Answer 1

For a unit vector, magnitude is 1
$\sqrt{ {(0.5)}^{2} + { (- 0.8)}^{2} + {c}^{2} } = 1 \\ 0.89 + {c}^{2} = 1 \\ {c}^{2} = 0.11 \\ c = \sqrt{0.11} \\ option \: (2)$