Clocking the velocity of falling objects
This program also works to plot velocities for the classic "picket fence" object as it falls past the sensor
On this web page, you can determine the momentary speed of any falling object at a given distance from its dropped point:
You can use a ball but a cylinder works better. A soup can or a small dowel of 3/4 inch or small length of pvc pipe works very well. Let it just fall off the table edge and pass in front of the sensor. Just measure down from table top to sensor position to get the fall distance. Then take the width of the cylinder and divide by the elapsed time as reported by the sensor via the USB port.