Press Start as you launch the rocket
Press Stop as soon as the rocket touches down
Press Reset to clear, or just hit Start again for the next flight!
Because a stomp rocket's energy is added instantaneously when the rocket is launched, its trajectory is purely ballistic. It goes straight up until it stops for just a moment, then falls back down. It takes an equal time going up and coming down, so we can divide the total time of flight in half to determine when the rocket was at its highest point. From there, we know how fast gravity pulls on an object ( per second faster, every second) and can calculate backwards to find how high up the rocket was when it started falling back to Earth.
The equation is: height = ½gt2
The g is for the acceleration of gravity, the t is for time (in our case, we'll divide total flight time by 2 to get t).
This calculator assumes launches are perfectly vertical and does not take air resistance in account.