Re-explain the following phrases in terms of momentum a. “an object in motion will

A. An object in motion will remain in motion unless acted upon by an outside force : The momentum of an object is constant unless an outside force acts on the object.

B. Force is defined as mass times acceleration : the rate of change of the momentum of a particle is proportional to the force F acting on it, hence the force is equal to mass times acceleration.

C. For every action there is an equal and opposite reaction : to every action force there is an equal and opposite reaction force. 

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