A 1750 kg Ford Mustang Convertible and a 2222 kg Dodge Ram 4x4 truck were involved in a head on car crash. The Mustang initially moving at a velocity of 20 m/s rebounds off the truck with a velocity of 12 m/s. After the collision, the Dodge Ram rebounds with a velocity of 5 m/s. What was the velocity of the Dodge Ram before it collided with the Mustang?