Two particles of mass m1 = 1.4 kg and m2 = 2.9 kg undergo a one-dimensional head-on collision as shown in the figure below. Their initial velocities aling x are v1i = 11 m/s and v2i = -7.2 m/s. The two particles stick together after the collision (a completely inelastic collision). (Assume to the right as the positive direction).  a) Find the velocity after the collision.  answer is - 1.27 m/s b) How much kinetic energy is lost in the collision?

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