Question

Vectors........................
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Answer 1

ANSWER :

ANSWER REFER TO THE ATTACHMENT PROVIDED.

Answer 2

Answer:

unit vector means magnitude of vector is unity .

1=√ {(0.4)²+(0.8)²+(b)²}

take square both side

1=0.16 +0.64 +b²

b² =0.2

b= √0.2