First, calculate the driving force (DF) using the power formula:

\(Power = Force × Velocity\)

\(Given power = 22.5 kW = 22500 W and velocity = 18 m/s,\)

DF = \(\frac{22500}{18} = 1250\) N

Using Newton's second law, the net force is given by:

\(Net Force = Mass × Acceleration\)

Let the resistance force be \(R\). Then,

\(DF - R = 800 × 1.2\)

\(1250 - R = 960\)

\(R = 1250 - 960 = 290 \text{ N}\)