A particle, moving in a straight line with speed 4U m s−14U\text{ m s}^{-1}4U m s−1, decelerates uniformly for 4 seconds, which reduces its speed to 2U m s−12U\text{ m s}^{-1}2U m s−1. It maintains this speed for a further 8 seconds before decelerating uniformly to rest in a further 2 seconds.
sketch a velocity-time graph for this information.
find an expression for each of the decelerations in terms of UUU.
Given the total distance is 90 m, find the value of UUU.
197 exam-style questions on Edexcel A Level Maths Constant Acceleration, covering 8.2 Modelling Assumptions, 8.3 Quantities and Units, 8.4 Working with Vectors, 9.1 Displacement-Time Graphs, 9.2 Velocity-Time Graphs, 9.3 Constant Acceleration Formulae 1, 9.4 Constant Acceleration Formulae 2, and 9.5 Vertical Motion Under Gravity. Each one has a worked solution and a mark scheme showing where the marks go.