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Every object continues in a state of rest of uniform speed in a straight line unless acted on by a nonzero force.

Newton's Second Law of Motion :

The relationship between an object's mass m, its acceleration a, and the applied force F is,F=ma.

Newton's Third Law of Motion :

For every action there is an equal and opposite reaction.

Impulse :

Impulse is the product of a net external force and time.

(Units are N s or Kgm/s).

SI unit of impulse :N.s =(kg:m/s^2).s=kg.m/s.