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

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

## Homework Statement

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.

## The Attempt at a Solution

You are given the two components of the vector v. Phytagoras will tell you how to find the magnitude of the velocity vector.

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

?

so, is it v = square root 6?

sophiecentaur
Gold Member

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.

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

i.e.$\underline{v}$.$\underline{v}$=v$^{2}$

SteamKing
Staff Emeritus