Question

The unit vector of a vector r = 3ỉ - 6j is​

Answer 1

Answer:

unit vector =a÷|(x²+y²)¹/²

=3i-6j/(9+36)root

= 3i-6j/3root5 [root45=3root5]

3i/3root5-6j/3root5

1i/root 5- 2j/root5

hence, option B is the answer

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