Hi, I hope this will help you to get started. A null vector is just A zero
vector e.g (0,0) in R^2 and (0,0,0) in R^3 (R denotes the real numbers).
A unit vector is a vector of norm e.g (1,0,0) and (0,1,0) both in R^3.
Collinear vectors are vectors which are non-zero scalar multiples of each other.
Example1 (1,1,1), (2,2,2) and example 2, (2,3,4), (4,6,8)
of each other.
||p||=$\displaystyle \sqrt{3^2 + 2^2 + 6^2}$= 7.
Hence L=3/7, M=-2/7 and N=6/7 (assuming L represents the x axis, M the y axis and N the z axis).
For the next bit of the question I would assume constant acceleration.
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Last edited by C.E; May 22nd 2009 at 05:28 PM.
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