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As in “Tenet”, how long does it take for the 747 to stop?



This acceleration applies to any change in speed. It doesn’t matter whether the speed of the object increases or decreases, it is still acceleration. If you know the acceleration of something, you can use the following equation of motion to find the stopping distance (it can be derived if needed).

Illustration: Rhett Allain

In this expression, v1 piece Is the starting speed (20 mph in this calculation), and v2 Will be the final speed-hopefully zero because it will stop. Therefore, under a known acceleration, the stopping distance (Δx) is:

Illustration: Rhett Allain

Now, I only need to get the acceleration value to stop the Boeing 747. Aha! That is not so easy. Of course, large aircraft will always stop, which is usually called “landing.” However, the conventional method during the login process does not work here. Generally, a large aircraft like the Boeing 747 uses two methods to slow down. It uses not only wheels with brakes, but also reverse thrusters. The reverse thruster is essentially the backward-directed force from the engine (hence the “reverse” part). This backward thrust and brake slow the aircraft.

For this stunt Tenet, Because the 747 aircraft cannot work normally, it will only brake. So, if the plane does not use reverse thrusters, what will be the acceleration? Well, we are lucky. This is the so-called rejected takeoff test (RTO). For this reason, the plane started to take off and got up to take off. At that time, the pilot slammed on the brakes (without reverse thrusters) and stopped. This is the worst-case test to ensure that the aircraft’s brakes can handle extreme conditions.


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