In the given question we already know the mass of the car. The mass of the car is 1000 kg. The acceleration at which the car needs to reach is 3 m/s^2. Based on these information's, the required answer can be easily deduced. We already know that
Force = Mass * Acceleration
= (1000 * 3) newton
= 3000 newton
So the amount of force that is required to move give the car an acceleration of 3m/s^2 is 3000 Newton.