A car with the mass of 1500.0 kg (initially moving to the right) collides with a bus that has a mass of 5000.0 kg. Before the car hits the bus, the car has an initial velocity of 22 m/s. The car and bus stick together and move off with a speed of 15 m/s (to the right). What is the initial velocity of the bus? Is the bus initially moving to the left or to the right?