Final answer:
The full-sized bus will have greater momentum than the small pick-up truck traveling at the same speed because momentum depends on both mass and velocity, and typically, a bus will have a greater mass than a pick-up truck.
Step-by-step explanation:
When comparing momentum, it is essential to understand that momentum is the product of mass and velocity. In the case of a small pick-up truck and a full-sized bus traveling at the same speed, to determine which has greater momentum, we must compare their masses.
Momentum (p) is calculated using the formula p = mv, where m is mass and v is velocity. Since the velocities (speeds) of the pick-up truck and the bus are the same, the object with the larger mass will have the larger momentum. Therefore, the answer to the question is: c. The full-sized bus, as it typically has more mass than a small pick-up truck.