To find the fundamental units involved in the given derived units, we first write their corresponding fundamental physical quantities and definitions.

i) newton (N)

Newton is the unit of Force. And, $$\rm Force = mass \times acceleration$$

$$\rm N = kg \cdot ms^{-2}$$

Therefore, newton involves three fundamental units: kilogram (kg), meter (m), and second (s).

ii) watt (W)

Watt is the unit of Power. And, $$\rm Power = Force \times velocity$$

$$\rm W = kgms^{-2} \cdot ms^{-1}$$

Therefore, watt involves three fundamental units: kilogram (kg), meter (m), and second (s).

iii) joule (J)

Joule is the unit of Work. And, $$\rm Work = Force \times distance$$

$$\rm J = kgms^{-2} \cdot m$$

Therefore, joule involves three fundamental units: kilogram (kg), meter (m), and second (s).

iv) pascal (Pa)

Pascal is the unit of Pressure. And $$\rm Pressure = \frac{Force}{Area}$$

$$\rm Pa = \frac{kgms^{-2}}{m^2}$$

Therefore, pascal involves three fundamental units: kilogram (kg), meter (m), and second (s).