please explain newton's third law of motion! 

Hi,
Statement of Newton’s third law
To every action there is always an equal and opposite reaction
This law explains that the force occurs in pair i.e. whenever there is an action there is always an equal and opposite reaction. Suppose if you pull an object then the object has a tendency to pull with an equal force in a direction opposite to the direction of applied force.
Example: Rocket- gas system-The rocket is propelled in upward direction because of the action-reaction principle.  
Hope this helps,
Good luck.

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