1. The problem statement, all variables and given/known data A particle of mass M is released from rest on a rough inclined plane, which makes an angle of 30° with the horizontal. It is observed that the particle moves a distance of 3 m in 3 s. What is the particle’s acceleration? Draw a properly labelled free body diagram. Calculate the coefficient of kinetic friction between the particle and the surface of the inclined plane. 2. Relevant equations i made the equation of force with the help of formula F=mg. Equation i made was mg*sin 30 - kinetic friction force = ma 3. The attempt at a solution i calculated coefficient of kinetic friction by tan 30 = 0.58 then i used equation mg.sin 30 - mg.cos30. 0.58 = ma. m got divided on both sides but i am getting value of a -0.02 something so what does that mean? acceleration is negative? mass is going up instead of down? its very confusing please help me. also how to use data it moves 3m in 3sec. why its given?