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I dont understand how to get velocity from (6.00i - 1.00j) ?

  1. Nov 20, 2011 #1
    I dont understand how to get velocity from (6.00i - 1.00j) ??

    1. The problem statement, all variables and given/known data

    Hey all, I have a problem where I am asked to find the velocity of something, but some data I am given says: "A 3.00kg object has a velocity (6.00i - 1.00j) m/s "

    What is the velocity of that? I dont quite understand how to get vel from that vector.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 20, 2011 #2
    Re: I dont understand how to get velocity from (6.00i - 1.00j) ??

    You are given the two components of the vector v. Phytagoras will tell you how to find the magnitude of the velocity vector.
     
  4. Nov 20, 2011 #3
    Re: I dont understand how to get velocity from (6.00i - 1.00j) ??

    I was reading over, and it says v^2 = v * v

    ?

    so, is it v = square root 6?
     
  5. Nov 20, 2011 #4

    sophiecentaur

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    Re: I dont understand how to get velocity from (6.00i - 1.00j) ??

    Wot, no notes or text book?
    Whats 6squared + 1squared?

    Look up how to find the magnitude and direction of a vector, given it's xy components. Or even how to find the resultant of two vectors at right angles.
     
  6. Nov 20, 2011 #5
    Re: I dont understand how to get velocity from (6.00i - 1.00j) ??

    I think that you were reading that the dot product (or scalar product) of the two vectors [itex]\underline{v}[/itex] gives the MAGNITUDE of the vector [itex]\underline{v}[/itex].

    i.e.[itex]\underline{v}[/itex].[itex]\underline{v}[/itex]=v[itex]^{2}[/itex]
     
  7. Nov 20, 2011 #6

    SteamKing

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    Re: I dont understand how to get velocity from (6.00i - 1.00j) ??

    Have you studied vector mechanics?
     
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