A car is travelling westwards along a straight road with a speed of 25\,m/s. East is taken as the positive x–direction. The driver applies the brakes, producing a uniform acceleration of +5m/s2 until the car comes to rest.
(i) Calculate the time taken for the car to come to rest.
(ii) Determine the displacement of the car during this interval and state its sign.
(iii) Explain whether the numerical value of the displacement would change if the positive direction were chosen to be westwards instead of eastwards.