Final answer:
The magnitude of acceleration for a jet slowing down with constant acceleration cannot be determined without additional data such as time and change in velocity. Given the necessary values, one could use kinematic equations to calculate this magnitude.
Step-by-step explanation:
The question at hand involves determining the magnitude of acceleration of a jet as it slows down with constant deceleration. To calculate this, we would need additional information such as the time taken to slow down and the change in velocity. However, this information is not provided in the material presented. In general, if we know that the jet is slowing down with constant acceleration and we have the necessary data, we could use the kinematic equations for constant acceleration to find the magnitude of the jet's deceleration.
It's important to note that this information is often represented graphically, as seen in the provided texts, where graphs showing velocity versus time can illustrate moments when acceleration is constant (the slope of the velocity-time graph) or when it changes.