1. The problem statement, all variables and given/known data Three forces acting on an object are given by F1 = ( 1.55 i - 1.90 j ) N, F2 = ( - 5.20 i - 3.15 j ) N, and F3 = ( - 50.0 i + 44.0 j ) N. (a) What is the direction of the acceleration? ° (from the positive x axis) (b) What is the mass of the object? kg (c) If the object is initially at rest, what is its speed after 16.0 s? m/s (d) What are the velocity components of the object after 16.0 s? ( i + j ) m/s 2. Relevant equations F=ma 3. The attempt at a solution the acceleration is 3.70 m/s2. i know to get the direction in part (a) i have to use arctan ay/ax but i cant figure out how to get those values. the velocity is 59.2m/s but i dont know how to get the unit vectors.