A one dimensional force is acting on a particle of mass 2 kg. The force is given by F = 4 |x| where x is the x coordinate of the particle. It starts from x = -4 m with an initial velocity of 5 m/s and reaches x = +4 m with velocity of v m/s. What is v? O 5 m/s 5 O 9.5 m/s approx. O 4.5 m/s approx. O 12.4 m/s approx.