Final answer:
In the scenario where a woman is reeling in a fish, the system generally experiences changing momentum due to the variability in the fish's motion and the woman's response. If the reeling is at a constant rate, the system undergoes constant acceleration. Nonetheless, a dynamic situation can lead to changing acceleration as well.
Step-by-step explanation:
The subject in question relates to Physics, particularly the concepts of momentum and acceleration. When a woman is reeling in a fish standing on the bank of a river, typically, her actions result in a changing momentum for the system consisting of the reel and the fish. Momentum is defined as the product of mass and velocity, and it changes whenever there is a change in velocity (as the mass of the system is constant in this scenario).
Acceleration is the rate of change of velocity. If the woman is reeling in at a constant rate, we could say there's constant acceleration. However, if the fish is pulling on the line and thus changing the velocity at non-uniform rates, the acceleration would be changing as well.
Using the provided context, if the motion at constant acceleration is being considered, it indicates that the rate at which her velocity is changing is constant. However, this could change depending on the dynamic situation of the fish pulling on the line and the woman's response to it.