Here's why:
* Velocity is a vector quantity that describes both the speed and direction of motion.
* Acceleration is the rate of change of velocity.
When an object's speed is increasing, its velocity vector is changing in the same direction as the acceleration vector. This means the object is accelerating in the direction of its motion.
Examples:
* A car accelerating forward on a straight road.
* A ball falling freely under gravity.
* A rocket launching into space.
Important Note: If the velocity and acceleration vectors are in opposite directions, the object is slowing down.
