Fire a Hotwheels car with a Rocket and Measure Velocity.

Step 2 Construct the Car

When you attach the Rocket Engine to the top of the car, first add straws to the sides so the tracks metal wires can go through them and keep the car on the track. Then Secure it, Electrical Tape as well as regular Duct Tape works well. Then when all the parts are secured, add the igniter and the plug to the back of the Rocket Engine.