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Find the unit vector in the direction of 2i+5j....

Find the unit vector in the direction of 2i+5j.

A.

129(2i+5j)

B.

129(2i+5j)

C.

129(2i5j)

D.

129(2i5j)

Correct answer is B

The unit vector, ˆn is given by ˆn=r|r|

= (2i+5j)(2)2+52=(2i+5j)29

= 129(2i+5j)