What is the expression for the velocity of the Car in Vector

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SUMMARY

The expression for the velocity of a car in vector form is defined as v = 63i + 0j + 0k, indicating motion solely in the x-direction. The discussion highlights confusion regarding the distinction between velocity and position vectors, emphasizing the need for clarity in problem statements. The position vector is represented as ##\vec{r}=r_i\cdot i +0j+0k##, where ##r_i## denotes the initial position along the x-axis. The use of unit vectors i, j, and k is essential for representing motion in three-dimensional space.

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  • Understanding of vector notation in physics
  • Familiarity with unit vectors i, j, k
  • Basic knowledge of kinematics equations
  • Ability to differentiate between velocity and position vectors
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  • Explore the concept of position vectors in three-dimensional space
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Homework Statement


upload_2019-2-10_20-45-49.png


Homework Equations


v = I + j + k
v = d/t

The Attempt at a Solution



I thought the answer was as simple as: v = 63i + 0j + 0k, since the car only has motion in one direction...
...but I got it wrong, so clearly I'm missing something here.
 

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The question is somewhat vague. I see two aspects that are unclear.
What units are to be used in the answer?
Does it want an expression for velocity or one for location?
 
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I think the problem wants the expression for the position vector too, that is ##\vec{r}=r_i\cdot i +0j+0k##. What is ##r_i## here?
 
Whoops. Sorry, I should've had this picture there too:

upload_2019-2-10_22-54-36.png
 

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it says using the speed v and the unit vectors i,j,k

maybe try ##v\cdot \vec{i} +0\cdot\vec{j}+0\cdot\vec{k}##
 
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Thanks. I knew it was something silly.
 
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