A car designer is designing a new model of a popular car. He wants to use the same engine as in the old model, but improve the new cars acceleration. Use newton second law to explain how to improve the car's acceleration without redesigning the engine

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. F = ma; a = F/m. This means that Force over the mass. In order to improve the acceleration without redesigning is that the company has to improve the force assuming that the mass is still the same.