Question

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what does the conservation of momentum state?
a momentum is always decreasing b momentum is conserved only in elastic collisions
c total momentum is constant in a closed system. this occurs when there is no impulse on the system. d momentum is always increasing

Explanation:

• Option A: Momentum doesn't always decrease; in a closed system with no external forces, it's conserved, so A is wrong.
• Option B: Momentum is conserved in both elastic and inelastic collisions (though kinetic energy differs), so B is wrong.
• Option C: The law of conservation of momentum states that in a closed system (no external net force/impulse), the total momentum remains constant. This matches the definition.
• Option D: Momentum doesn't always increase; it's conserved in closed systems, so D is wrong.

Answer:

C. Total momentum is constant in a closed system. This occurs when there is no impulse on the system.