How do you slingshot a homemade car?

To slingshot a homemade car, you'll need a sturdy ramp and a mechanism to launch it, such as a rubber band or bungee cord attached to a fixed point. First, secure the car at the base of the ramp and attach the elastic material to the car's rear. Pull the car back to stretch the elastic, then release it to propel the car forward down the ramp. Ensure safety precautions are taken to prevent injury or damage during the launch.