1. A snowboarder of mass 60 kg is at rest on the top of a sand dune. The coefficients of static and kinetic friction are 0.55 and 0.4675, respectively. 60 kg μk = 0.4675 μs = 0.55 What is the angle the incline must exceed so that the snowboarder starts sliding? The acceleration of gravity is 9.8 m/s2 . Answer in units of ◦. 2. What is the acceleration down the incline if = 35 ◦, exceeding the value found in the previous question? Please help. I am so confused.