20 Three cars travel along an east-west roadway. The car's velocities relative to the Earth are shown below. Car A: 10 m/s east Car B: 20 m/s west Car C: 30 m/s east What is the velocity of Car C in the reference frame of Car A? O 40 m/s west 20 m/s west 40 m/s east 20 m/s east O zero