Correct. A fly on the seat of your car travels 0 m/s with respect to the car and to you, but travels, say, 30 m/s with respect to the road. Speed (and velocit

Correct. A fly on the seat of your car travels 0 m/s with respect to the car and to you, but travels, say, 30 m/s with respect to the road. Speed (and velocity, for that matter) always needs a reference to be meaningful.