Four particles are in a 2D plane with masses, x and y positions, and x and y velocities as given in the table below:
m 
x 
y 
v_{x} 
v_{y} 

1 
8.9 kg 
2.4 m 
4.7 m 
3.1 m/s 
4 m/s 
2 
7.8 kg 
3.6 m 
3.5 m 
5.2 m/s 
5.1 m/s 
3 
8.7 kg 
4.4 m 
5.7 m 
6 m/s 
1.9 m/s 
4 
7.6 kg 
5.6 m 
2.5 m 
4.2 m/s 
3.1 m/s 
1) What is the x position of the center of mass?
2) What is the y position of the center of mass?
3) What is the speed of the center of mass?
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