How do they work?
Those events can be divided in three phases.
The Boost Phase
It usually lasts somewhere around 3 to 5 minutes depending on the type of rocket fuel being used.
Also depending on the trajectory chosen, typical burnout speed is 4 〜 7.8 km/s.
Altitude at the end of this phase is typically 150 to 400 km.
Here, the rocket reaches space (sub-orbital spaceflight).
At this point the rocket is going to be moving incredibly fast, somewhere around 25,000-27,000 km/h (7〜7.5 km/s).
Halfway through the midcourse phase the rocket will fly at an altitude of 1,200 km and by the ending phase it will reach altitudes between 3,000-6000 km .
This is where the missile will reach it’s fastest velocity.
The nose cone section carrying the warhead separates from the final rocket booster and drops back to Earth.
At this point the warhead is only minutes from the target, and it is also impossible to use any counter-measures to stop it from finishing its path.