A rough plane is inclined to the horizontal at angle α\alphaα, where tanα=512\displaystyle \tan \alpha = \frac{5}{12}tanα=125. A block of mass m m\,m kg is placed on the plane and released from rest. The coefficient of friction between the block and the plane is 25\displaystyle \frac{2}{5}52
Find the acceleration of the block. Hence find the speed of the block after 13 seconds.
A different block with mass 2m kg is placed on the same plane. Explain how the acceleration of this block would compare to your answer in part (a).
108 exam-style questions on Edexcel A Level Maths Forces and Friction, covering 5.1 Resolving Forces, 5.2 Inclined Planes, and 5.3 Friction. Each one has a worked solution and a mark scheme showing where the marks go.