Center of Mass of a System Problem

[catstevens]

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

From an inertial reference frame S, the vector position of a particle of mass
m1 = 1kg is given by r1(t)=(txhat - t^2yhat)m.
The vector position of a particle m2=2m1 is given by r2=(t)=(txhat +t^3yhat)m

Assume t=1second
Find the position, the velocity and the acceleration of the center of mass of the composite system: xCM vCM a CM


2. Relevant equations

m1 x1(1) + m2 x2(1) / m1 + m2


3. The attempt at a solution

3xkg/ 3kg = 3x-direction

velocity = x
acceleration = 0

I do not think this is right, could some one help?
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution

[Saladsamurai]

There is an x and y component to the position vector. You need to take both into consideration.