Explain Newton's second law of motion ?

Explain Newton's second law of motion ?
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Newton's second law of motion is: "The rate of change of mass velocity of an object is proportional to the force applied to it and the velocity of the object changes in the direction in which the force acts." Suppose an object with mass m is moving at primordial velocity. Now the constant force of F acts on the object in the direction of velocity for a period of time, so its velocity changes from u to v .
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