# y velocity

## Description

The block reports the y velocity of the sprite.

## Example

### Bouncing Ball – Coefficient of Restitution

In this example, we will analyze the effect of the bounce property of the sprite using a ball. We will track the ball using the pen extension and the color will change with the y velocity of the ball.

In this example, we will analyze the effect of the bounce property of the sprite using a ball. We will track the ball using the pen extension and the color will change with the y velocity of the ball.

The coefficient of restitution is the ratio of the final to the initial relative speed between two objects after they collide. In PictoBlox it is controlled with bounce property. It varies from 0 to 100%.

The following is the code we will use:

Let’s see how the code work will various bounce values:

1. Bounce = 10
2. Bounce = 60
3. Bounce = 70
4. Bounce = 80
5. Bounce = 90
6. Bounce = 99

#### Earth vs Moon

If we change the gravity with a bounce value equal to 90, we can simulate how the ball will work on the moon.

### Falling Ball on Incline

The example demonstrates how to set up the stage with obstacles and make a ball fall on a series of inclines.

The example demonstrates how to set up the stage with obstacles and make a ball fall on a series of inclines.