1. Two cars are moving in the same direction at the same speed. What is the speed of either car with respect to the other? 2. Two buses are moving north, the first at 30 km/h and the second at 20 km/h. (a) What is the relative speed and direction of motion of the first bus with respect to a person seated in the second bus? (b) What is the relative speed and direction of motion of the second bus with respect to a person seated in the first bus? 3. A car moving north at 30 m/s passes a bus moving north at 25 m/s. (a) What is the relative speed and direction of motion of the car with respect to a person seated in the bus? (b) What is the relative speed and direction of motion of the bus with respect to a person seated in the car