Two particles of mass m = 1.6 kg and m = 2.8 kg undergo a one-dimensional head-on collision as shown in the figure below. Their initial velocities along x are v = 13 m/s and v21 = -6.5 m/s. The two particles stick together after the collision (a completely inelastic collision). (Assume to the right as the positive direction.) m1 (a) Find the velocity after the collision. m/s Enter a number. (b) How much kinetic energy is lost in the collision? J 1112