Question

Derive the Three Equations of Motion.

Answer 1

first la- a body continues to be in its state of rest or of uniform motion in a straight line unless an external force is applied on it

second law- the rate of change of momentum of a body is directly proportional to the force applied on it and this change in momentum takes in the direction of the applied force f~delta p/delta t

third law - to every action there is always an equal and opposite reaction 
vector f12=-vector f21