Aprojectile is shot upward at a 60 degree angle with the ground at 200m/s how far has the projectile horizantally gone at the end

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?