The amount of work you would need to do in order to stop a 1100kg car with 1400J of kinetic energy is 1400J.
In order to determine the amount of work needed to stop a 1100kg car with 1400J of kinetic energy, we can use the work-energy theorem.
The work done on an object is equal to the change in its kinetic energy.
Since the car is brought to a stop, its final kinetic energy is 0J.
Therefore, the work done to stop the car is equal to the initial kinetic energy.
So, the work done = 1400J