Spring gun Recoil question?

A light spring-gun projectile launcher is mounted on an 0.633 kg air track glider. The gun points upward at an angle of 29 o with the horizontal track. With the glider at rest, a 61.3- g projectile is fired from the gun with a speed of 2.87 m/s. What is the speed of the air-track glider after the gun is fired?