6 aw

-/2 Points] DETAILS HOLTPHYS06 6.P.030. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A railroad car with a mass of 2.09 x 104 kg moving at 3.10 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.56 m/s. (a) What is the speed of the three joined cars after the collision? m/s (b) What is the decrease in kinetic energy during the collision? Submit