A car travelling at 30 m/s applies its brakes and decelerates uniformly at 5 m/s². What distance does the car cover before coming to rest?

Using the equation v² = u² - 2as, with v = 0, u = 30 m/s, and a = 5 m/s²: 0 = 900 - 2 × 5 × s, giving s = 900/10 = 90 m. Option C results from using s = u²/a instead of u²/2a, and option A from using s = ut/2 with incorrect time.