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2. A brick sits on a clean lab bench. The brick has a mass of 3.5 kg, and the coefficient of kinetic friction between the brick and the lab bench is 0.18. A horizontal force of 30 N is applied to the brick. What is the acceleration of the brick? [6 marks] 3. A 650-N student is Rollerblading at a velocity of 7.8 m/s [W] when the student trips and slides horizontally along the trail, coming to a stop in 0.95 s. [6 marks] (a) Determine the student's average acceleration. (b) Draw an FBD of the student sliding on the trail. (c) What is the kinetic friction as the student slides