Mass 	x pos 	y pos	x vel	y vel
 25.0	400.0 	400.0 	0.0 	0.0
 20.0 	200.0  400.0 	3.0	4.0
 30.0	50 	600.0 	1 .0	2.0
 50.0 	400.0  200.0 	1 .0	-2.0
 40.0 	700.0 	700.0 	-1 .0	-2.0