A cyclist is riding at 8.0 m/s along a level path when she sees a dog run out ahead of her. Her reaction time is 0.50 s. She and her bicycle come to rest 12 m from the point where she saw the dog. The combined mass of the cyclist and bicycle is 80 kg. Assume that the braking force is constant and that other resistive forces are negligible.
Calculate the magnitude of the mean resultant force on the cyclist and bicycle during braking.
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.