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The linear momentum (symbol p) of an object is its velocity multiplied by its mass. The SI unit for momentum is kg·m/s or N·s. In a closed system, total linear momentum is conserved. This can be observed in many scenarios, such as elastic collisions, where linear momentum is conserved save for a tiny amount lost to friction.

Momentum is equal to the integral of force with respect to time, or

p = \int^b_a F(t) dt

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