A fire engine has a thinking distance of 4.0 m and a braking distance of 8.0 m when travelling at 8.0 m/s. The speed is increased to 12.0 m/s. The driver's reaction time, the mass of the fire engine and the resultant braking force remain unchanged. What is the stopping distance at 12.0 m/s?
24 m24\ \mathrm{m}24 m
21 m21\ \mathrm{m}21 m
18 m18\ \mathrm{m}18 m
27 m27\ \mathrm{m}27 m
126 exam-style questions on Edexcel GCSE Physics 2.5 Stopping and braking distances, covering 2.5.1 Stopping distance and reaction time, 2.5.2 Factors affecting stopping distance, 2.5.3 Dangers of large decelerations, and 2.5.4 Braking distance and initial speed. Each one has a worked solution and a mark scheme showing where the marks go.