Problem With Maximum Acceleration up Hill!! 1. The problem statement, all variables and given/known data cross-country skier is going up a slope at angle 5º to the horizontal. She is skating so only her skis provide the propulsion (i.e. she does not push with her ski poles). The static and kinetic friction coefficients for this situation are μs = 0.12, μk = 0.07 respectively. Find the magnitude of her maximum possible uphill acceleration? 2. Relevant equations Fnet=MA 3. The attempt at a solution So Far: Fnet(x)= F(static) - F(kinetic) - Fg = ma Fnet(x) = (0.12 x m x 9.8cos85) - (0.07 x m x 9.8cos85) - (9.8cos85 x m) = ma Divide by m you get: Fnet(x) = (0.12 x 9.8cos85) - (0.07 x 9.8cos85) - 9.8cos85 = a Therefore a= - 0.81m/s^2 But this gives me a negative accelleration, Where did I go wrong? as it asks for the Max acceleration up the hill and that acceleration would point down hill. HELP PLEASE!!!