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1.What is inertia and how is it related to Newton's first la

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1.What is inertia and how is it related to Newton's first law of motion?
2.How can an object's acceleration be calculated using Newton's second law of motion?
3.According to Newton's third law of motion,how are the forces between interacting objects related?
1) Newton's first law rephase that an object in motion will tend to stay in motion,which means even an object is stopped by a strong force,it will still move until it deaccelerate to stop.
2) Base on Newton's second law,F= MA,we can rephase it into A=F/M
3) Base on Newton's third law,when an object apply a force to another object,the second project will apply the same force back to the first object to the opposite direction.