When does the flight motor burn out?

• A. Within 100 meters or for 1.6 seconds
• B. After 2 seconds
• C. After 3 seconds
• D. Immediately on launch

Answer: (A)

The flight motor is the initial booster that gets the missile out of the launcher and into powered flight. For this system, that booster is designed to burn for a short, fixed window, about 1.6 seconds, and it covers roughly 100 meters before burnout. That means most of the launch thrust happens early, and after about 1.6 seconds the motor stops firing, and the missile continues its flight under its inertial guidance and whatever propulsion, if any, remains as the mission profile dictates. The other options don’t fit the actual burn profile: it isn’t immediate on launch, and it isn’t sustained for 2–3 seconds, so the motor would still be burning far beyond the specified 1.6 seconds and 100 meters.