If an object accelerates in the same direction as it is moving, its speed increases. Here's why:

* Acceleration is the rate of change of velocity.

* Velocity has both speed (how fast) and direction.

* When acceleration is in the same direction as the velocity, the object gets faster in that direction.

Think of it like this:

* Imagine a car moving forward. If you press the gas pedal (accelerating in the same direction as the car's motion), the car goes faster.

* On the other hand, if you apply the brakes (accelerating in the opposite direction), the car slows down.

So, acceleration and speed are directly related when they act in the same direction.