First, calculate the driving force using the power formula:

\(Power = Force × Velocity\)

\(Given power = 20,000 W and velocity = 25 m/s,\)

Driving force = \(\frac{20,000}{25} = 800 \text{ N}\).

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

\(Net force = Driving force - Resistance = 800 - 600 = 200 \text{ N}.\)

According to Newton's second law, \(F = ma\), where \(F\) is the net force, \(m\) is the mass, and \(a\) is the acceleration.

Substitute the known values:

\(200 = 1000a\)

\(a = \frac{200}{1000} = 0.2 \text{ m s}^{-2}\).