The breaking distance of a car depends on its speed as the brakes are applied and on the car's braking efficiency. A formula for the braking distance is:
ba = 2Rs
Where ba is the braking distance, s is the car speed, R is the braking efficiency, and g is the acceleration due to gravity (9.81).
Write a function to calculate the braking distance provided that s and R are the inputs for the function. Calculate the braking distance for a car speed range of 0 - 200 km/hour and use subplot and plot functions to present car speed vs braking distance for different braking efficiencies: 25%, 50%, 75%, and 100%. (Speed is given in km/hour, which needs to be converted into m/s).