The correct answer is Kg·m/s2. Explanation & Key Takeaways: • The pressure is the perpendicular force acting per unit area. • SI unit of pressure is Pascal, which is equivalent to 1 N force acting per sq. meter. • It is given by, P = \(F\over A\) Related Concepts: • Its unit can also be derived from the formula as N/m^(2). • Kg·m/s2 is the derived unit of force. • \(1 Pascal = {F \over A} \) \(= {ma \over A} \)\(= {Kg{m/s^{2}} \over m^{2}} \) = Kg/(m·s2). Important Notes: • Both pressure and stress are given by the same formula i.e. \(F\over A\). • The main difference between them is the angle at which the force is applied to a body. • When the force applied to a body is perpendicular to the area, it is called pressure. • If the angle is other than 90°, then it is called stress. Common Pitfalls: • Kg·m/s2 is the SI unit of force and not of pressure. • The question asked is about the one which cannot be the unit, since options 2 and 3 are very close, so answer the question patiently.