In a freight car sorting yard, a loaded boxcar with a weight of 210,000 pounds moving to the right at a speed of 5.5 MPH at the instant just before impact rolls into and couples with a center beam car moving to the right with a speed of 1 MPH carrying drywall with a total car weight of 280,000 pounds. The cars are on a level section of track. Immediately after the cars couple, how fast are they moving? They are still moving to the right, aren't they?