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

  • #1
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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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Answers and Replies

  • #2
haruspex
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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?
 
  • #3
Delta2
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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?
 
  • #4
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Whoops. Sorry, I should've had this picture there too:

upload_2019-2-10_22-54-36.png
 

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  • #5
Delta2
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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}##
 
  • #6
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Thanks. I knew it was something silly.
 

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