A photograph shows a 0.3 kg bat traveling at 55 m/s just before it strikes a 0.05 kg ball at rest on a tee. After the collision, the bat travels in the same direction at 42 m/s. What is the speed of the ball just after impact?

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?