Question

can anyone explain the newtons first three laws and equations also

Answer 1

1st. law. Newton's first law of motion if a body is in a state of rest it will remain in the state of rest and if it is in the state of motion it will remain moving in the same direction with the same speed unless and external force is applied on it.

first law can be understood in the
following two parts definition of inertia and definition of force:

definition of inertia: in the first part Newton's first law give the definition of inertia according to which an object cannot change its state by itself if the object is in the state of rest I will remain the state of rest and if it is movie in some direction it will continue to move with the same speed in the same direction unless and external force is applied on it

definition of force : second part of Newton's first law defines the force according to which force is that external cause which can move a stationary object or which can change the state of motion of a moving object.

Answer 2

Newton's first law :
Every object continue its state if a object at rest then it will in rest and in motion then continue its motion unless external force applied . 
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if applied force = 0 then 
F= ma 

a = 0 ;

2nd law :
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The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
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F α dp / dt 

3rd law :
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To every action there is equal and opposite reaction .

Fab = -Fba 
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