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! align="center" | Mass
| align="left" | The mass of a ship. Less mass equals better maneuverability.The numerical representation of ship's inertia
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! align="center" | Length
In classical mechanics, for a body with constant mass, the acceleration of the body is proportional to the resultant (total) force acting on it (Newton's second law):
:<mathblockquote>\mathbf{'''F} = m\mathbf{.a} \quad \to \quad \mathbf{ → <i>a} </i> = \mathbf{F}/m'''</mathblockquote>
where F is the resultant force acting on the body, m is the mass of the body, and a is its acceleration.