A tractor of mass 2400 kg is travelling at 12 m/s when its driver sees a closed gate 27 m ahead. Once the brakes are applied, they produce a constant resultant braking force of 9600 N. What is the longest reaction time the driver can have for the tractor to stop just at the gate?
3.00 s3.00\ \mathrm{s}3.00 s
0.75 s0.75\ \mathrm{s}0.75 s
1.50 s1.50\ \mathrm{s}1.50 s
2.25 s2.25\ \mathrm{s}2.25 s
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.