* Acceleration is the rate of change of velocity.
* Velocity has both speed and direction.
* Since the car is moving in a straight line, the direction of its velocity remains constant.
* However, the car's speed is increasing from zero, meaning its velocity is changing.
* A change in velocity, even if only in speed, indicates acceleration.
* Since the speed is increasing, the acceleration is in the same direction as the velocity, making it positive.
Important Note: We're talking about *linear acceleration* here. If the car were to change direction, it would also experience a change in acceleration.
