Momentum is calculated using the formula:
\[ \text{momentum} (p) = \text{mass} (m) \times \text{velocity} (v) \]
Given this formula, an object will have the greatest momentum when both its mass and velocity are large.
Among the options provided:
- An object with a small mass is moving slowly.
- An object with a large mass is moving slowly.
- An object with a large mass is moving quickly.
- An object with a small mass is moving quickly.
The situation with the greatest momentum would be: An object with a large mass is moving quickly.
This combination maximizes both mass and velocity, resulting in the highest momentum.