It seems like there's a typo in your question. The standard unit for acceleration is meters per second squared (m/s²), not "mss".

Assuming you meant an acceleration of 40 m/s², we can use Newton's second law of motion to calculate the necessary force:

Newton's Second Law: Force (F) = Mass (m) × Acceleration (a)

* Mass (m): 1250 kg

* Acceleration (a): 40 m/s²

Force (F) = 1250 kg * 40 m/s² = 50,000 Newtons (N)

Therefore, a force of 50,000 Newtons is necessary to accelerate the 1250 kg car at a rate of 40 m/s².