A car has a thinking distance of 10 m and a braking distance of 20 m at speed vvv. Its speed increases to 1.5v 1.5v\,1.5v and the driver’s reaction time doubles. The car’s mass and braking force are unchanged. What is the new stopping distance?
75 m75\ \mathrm{m}75 m
45 m45\ \mathrm{m}45 m
60 m60\ \mathrm{m}60 m
90 m90\ \mathrm{m}90 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.