As part of the new Bicycle Corps, a solider is pedaling down the road at 25 km/h, holding a missile launcher on his shoulder. The combined mass of the bicycle and the solider is 8o kg, and the single missile in the launcher has a mass of 0.5 kg. He launches the missile and, as it leaves the launcher, it has a velocity of 500i m/s relative to the launcher. What is the velocity of the solider/bicycle immediately following the launch?