Velocity and vector calculus

  • Thread starter Engels
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  • #1
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Homework Statement



An object moves according to this : r(t)= (1+t^2)i + (1-t)j + (t+t^3)k

How fast does it moves far from O(0,0) for t=1?

Is this velocity the same with the object's velocity?


The Attempt at a Solution



I cant understand the second part
 

Answers and Replies

  • #2
radou
Homework Helper
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I can't seem to understand the second part either.

By the first one, do you mean, what its velocity is at t = 1, or what its position is? What is the relation between the two?
 
  • #3
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i mean the velocity for t=1 which is r'(1)= 2i-j+4k
The r(t) in my previous post is the position vector from the start (0,0)

is the any reason for not the r'(t) or r'(1) to be the objects velocity?
 

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