An old fashioned hockey puck launcher is comprised of a heavy launcher with a mass of 3.1 kg and a puck with a mass of 0.11 kg. After the launcher and puck are set in motion with a velocity of 0.34 m/s, a small "explosion" takes place within the launcher, causing the puck to be launched forward at a fast speed.

After the explosion, the cart moves backward at 0.11 m/s. What is the velocity in meters per second of the puck after launching? (consider forward as positive and backward as negative)