Inclined plane has angle of inclination 0 = 30 . and side Al = 80 1) Calculate the lengths of sides AB and BI. From the point A body of mass m = 2kg is launched, which moves on AB and reaches B with speed 20m / s. 2) If the coefficient of kinetic friction uk body - level is 0.2, to design and calculate all the forces exerted on the body when it is in the middle M of distance AB. 3) Using the Project - Energy Theorem to calculate the launch speed at point D. 4) How long after the launch does the body reach point B? An ideal weightless spring 2000 k = 2000 N / A is used for launching from the point m. When the body touches the compressed spring, the body position is at the starting point (point A)