no. see the definition of acceleration. it can remain a constant speed while the velocity changes. *Edit* Actually, the answer is yes. The algebraic formula for acceleration is displacement over time...
When you step on the pedal, the motor is propelled by a ticker which forces the belt to turn. This then propels the wheels forwards and the speed on the speedometer is determined by a mechanical...
A car has a speedometer. When you read the speed that it indicates, and youknow the direction in which you're driving, then you know the car's velocity.