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Find the unit vector in the same direction as:

$$\mathbf{v}= -9 \mathbf{i} + 40 \mathbf{j}$$

A

$-\cfrac {9}{41}\mathbf{i}+\cfrac{40}{41}\mathbf{j}$

B

$-\cfrac {81}{41}\mathbf{i}+\cfrac{1600}{41}\mathbf{j}$

C

$-\cfrac {9}{1681}\mathbf{i}+\cfrac{40}{1681}\mathbf{j}$

D

$-\cfrac {81}{1681}\mathbf{i}+\cfrac{1600}{1681}\mathbf{j}$

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