Final answer:
A slow moving feather has more momentum than a parked car because the car's velocity is zero, making its momentum zero, while the moving feather has both mass and velocity, yielding a non-zero momentum.
Step-by-step explanation:
Momentum is defined as the product of an object's mass and its velocity. When comparing the momentum of a large parked car and a slow moving feather, it's important to note that momentum depends on both mass and velocity. A large parked car has no velocity and thus has no momentum. However, a feather that is moving, irrespective of its speed, has momentum since both its mass and velocity are non-zero.