4. Suppose a point mass m is moving in one-dimension along the x-axis under a force given by F = }m|x|. At time t = 1 the object is located at x = +0.5 and has a velocity (1) = +0.15 m/s and zero acceleration. (a) Find x(2), (2) and (2) using a numerical iterative method with = 0.2 s (so 5 steps), showing the values at each step. (b) Do the same as (a) but use = 0.1 s (so 10 steps).