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First law: The velocity of a body remains constant unless the body is acted upon by an external force.

So, if F is the net force acting on the body and ais the body's acceleration (the rate of change of its velocity) then the first law says that:

"If F = 0 then a = 0."

This in fact follows from Newton's second law, which states that F = ma (where m is the body's mass).

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13y ago

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