Two football players collide on the goal line in football. The running back (trying to score from the one-yard line) weighs 80 kg. and is traveling at 6 m/s when met head on by a 110 kg. linebacker running at 4 m/s, at impact. If after the impact, the two move together as one, (a) what is their combined velocity? (b) who wins the battle at the battle at the goaline?