Two vehicles (a car and a truck) are involved in a collision and stick together. Just before the crash, the car, with a mass of 1400.0 kg , is travelling North with a velocity of 50.0 mph while the truck, with a mass of 2100.0 kg , is travelling West with a velocity of 73.0 mph (as shown below) (East = 0°, North = 90°, West = 180°, South = 270°)

The magnitude of the velocity of the vehicles after the collision will be:

______mph