State Newton's second law of motion.

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(N/A) Newton's second law of motion states that the rate of change of linear momentum of a body is directly proportional to the external force applied to it,and this change takes place in the direction of the applied force.
Mathematically,it is expressed as $F = \frac{dp}{dt}$,where $F$ is the force and $p$ is the linear momentum.
For a body of constant mass $m$,this simplifies to $F = ma$,where $a$ is the acceleration of the body.

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