Explanation:Newton's motion equation: v^2 = u^2 – 2as…….. where a: retardation (opposite of acceleration) and s: distance covered. 1st case: u = 30 km/h = 25/3 m/s v = 0, s = 8 m Therefore, 0^2 = (25/3)^2 - 2 × a × 8 This gives a = 4.34 m/s^2 2nd case: u = 60 km/h = 50/3 m/s v = 0 a = 4.34 m/s^2 Now, 0^2 = (50/3)^2 - 2 × 4.34 × s This gives s = 32 m Thus on applying brakes the car will stop after covering 32 m. 3.5k views · View 13 Upvoters Related QuestionsMore Answers Below Three cars (car F, car G, and car H) are MOVING with the same speed and slam on their brakes. The most massive car is car F, and the least mas... A car was traveling at 12 m/s when the driver stopped on the brakes. If the car comes to a fuel stop in 5 sec, what was its AVERAGE speed? And... How will we determine the speed of a moving car? A car and bike are moving at the same velocity. If the brake is applied at the same time, then who is the first in a resting motion? In 2 hours 40 mins, a car travels 100km. At what speed is the car traveling? Kaustubh Roy Kaustubh Roy, Junior Research Fellow at Indian Institute of Science Education and Research, Kolkata (2018-present) ANSWERED Jul 27, 2018 first of all, a car that moves at 30km/s is a rocket. (Escape velocity of earth is 11km/s) It shouldn’t stop if you brake it at 30km/s COZ you’d be safely in outer SPACE where there’s no ground friction. But! If you have a magic thruster engine that can stop a rocket moving at 30km/s in just 8m, you probably shouldn’t worry about it moving at 60km/h. It’ll stop in no time. :)