A?1000 kg aircraft going?25 m/s collides with a?1500 kg aircraft that is parked. They stick together after the collision and…

A?1000 kg aircraft going?25 m/s collides with a?1500 kg aircraft that is parked. They stick together after the collision and are going?10 m/s after the collision. If they skid for 16.9seconds before stopping, how far did they skid?? Hint: Are the aircraft moving at a constant velocity after the collision or do they experience an acceleration?