The power due to the engine can be calculated using the formula:
Power = Force × Velocity
In this case, the force acting against the car's motion is the frictional force. So, the power due to the engine can be calculated as follows:
Power = Frictional Force × Velocity
Given that the frictional force is 400N and the velocity is 100m/s, we can substitute these values into the formula:
Power = 400N × 100m/s
Power = 40,000 N·m/s
Therefore, the power due to the engine is 40,000 watts (W).