Two football players collide head-on in midair while chasing a pass. The first player has a 94.5 kg mass and an initial velocity of 6.40 m/s, while the second player has a 114 kg mass and initial velocity of -5.1 m/s. What is their velocity (in m/s) just after impact if they cling together? (Indicate the direction with the sign of your answer.) s