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【单选题】

质点系的动量定理,说的是___The Momentum Theorem for Particle Systems says___

A.
质点系合外力的冲量,等于质点系动量的增量; The Momentum of Particle System is equal to the momentum increment of particle system;
B.
质点系合外力的冲量,等于质点系动能的增量; The Impulse of particle system is equal to the increment of Kinetic Energy of particle system;
C.
质点系合外力的冲量,等于质点系势能的增量; The Impulse of the particle system is equal to the increment of the Potential Energy of the particle system;
D.
质点系合外力的冲量,等于质点系机械能的增量; The Impulse of particle system combined with external force is equal to the increment of Mechanical Energy of particle system;
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