hm yeah, I'm pretty bad at physics I'm not sure how to set up this problem. care to help? I know the answer is 4.51 m/s.... A 5.00x10^2 kg log collides inelastically with a second with the same mass. These combined logs then collide with a third log with a mass of 5.00x10^2 kg. The final speed of the three combined logs is 3.67 m/s. If the speed of the third log before collision was 3.00 m/s, and the speed of the second log before collision was 3.50 m/s, what was the speed of the first log before collision?