Newton First Law: In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force. Mathematically: Sum of all forces = 0 or dv/dt = 0 Newton Second Law: In an inertial reference frame, the vector sum of the force F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. Mathematically F is directly proportional to acc 'a'. & F is directly proportional to acc 'm'. than remove proportional sign, put = & constant 'k'. since k=1 so, F=ma Newto...