what acceleration formula do i use

Theory and Background: One can determine the acceleration of the system depicted in Figure 1 by using Newton's Second Law to analyze the motion. Assuming that the frictional force f is negligible and that the pulley is massless and frictionless, the acceleration a of the system is! . (1) Alicia Harner 1 Inclined Plane Semester_Fall Year 2925 where (Write down the appropriate equation; define all variables that haven't been defined yet.) mg * One can find the sine of the angle of the incline Figure 1: Schematic of Forces in Exneriment. Courtesv Driscoll. (vear)