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posledela
3 years ago
9

Vector v has its initial point at (7, -9) and its terminal point at (-17, 4). Which unit vector is in the same direction as v?

Mathematics
2 answers:
LuckyWell [14K]3 years ago
4 0
The answer is the option C 

Find unit vector.

Definition of unit vector :

<span>u is a unit vector, it has the same direction as v then </span>

v--------------(7,-9)         (-17,4)

v=(-24,13)

u<span> is a unit vector, it has the same direction as </span>v

magnitude of v---------(-24^2+13^2)^0.5=725^0.5

 u=(-24/(725)^.5),(13/(725)^.5)



mezya [45]3 years ago
4 0

Answer:

u_{v}=-\frac{24}{\sqrt{745} }i +\frac{13}{\sqrt{745} } j

Step-by-step explanation:

The initial point of the vector is at (7,-9).

The terminal point of the vector is at (-17,4).

First, we need to find the same vector with initial point at the origin of the coordinate system. We do that by finding its horizontal length and its vertical length.

\Delta x = -17 - 7=-24\\\Delta y = 4-(-9)=13

So, the vector with initial point at the origin is

v=-24i+13j

Where i represents horizontal direction and j represents vertical direction.

Now, we need to find the module of this vector

|v|=\sqrt{(-24)^{2}+(13)^{2}  }=\sqrt{576+169}\\  |v|=\sqrt{745}

The uni vector is defined by the quotient between the vector and its module.

u_{v} =\frac{v}{|v|}

Replacing each part, we have

u_{v}=\frac{-24i+13j}{\sqrt{745} }\\  u_{v}=-\frac{24}{\sqrt{745} }i +\frac{13}{\sqrt{745} } j

Therefore, the right answer is the third choice.

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