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22 votes
22 votes
please help me solve this problem. I am familiar with this concept but im not sure what the process to solve is

please help me solve this problem. I am familiar with this concept but im not sure-example-1
User Knub
by
2.6k points

1 Answer

14 votes
14 votes

Answer:

v = 1/5 ( 3i - 4j)

Step-by-step explanation:

A unit vector is a vector whose magnitude is 1.

The unit vector is given by


\hat{v}=\frac{\vec{v}}v

where |v| is the magnitude of the vector.

Now in our case, we have


\vec{v}=3\hat{i}-4\hat{j}

The magnitude of the above vector


|\hat{v}|=\sqrt[]{3^2+4^2}
=\sqrt[]{9+16}
=\sqrt[]{25}=5

Hence,


|\hat{v}|=5

therefore, the unit vector is


\vec{v}=\frac{3\hat{i}-4\hat{j}}{5}

or to write it another way


\boxed{\hat{v}=(1)/(5)(3\hat{i}-4\hat{j})\text{.}}

User Matt Klepeis
by
3.2k points