You can't change speed into velocity directly because velocity is not just speed, it's speed with a direction. Think of it like this:

* Speed is how fast you're going.

* Velocity is how fast you're going and in which direction.

Here's how you can express speed as velocity:

1. Specify the direction: If you know the speed of something, you need to add a direction to turn it into a velocity. For example:

* Speed: 50 miles per hour

* Velocity: 50 miles per hour north

2. Use vector notation: Vectors are mathematical objects that have both magnitude (size) and direction. Velocity is represented as a vector, often written as:

* v = (50, 0) (where 50 is the speed and 0 represents the direction, possibly north)

Important Note: Speed is a scalar quantity (only magnitude) and velocity is a vector quantity (magnitude and direction). You can't simply "change" one into the other, but you can specify the direction of a speed to make it a velocity.