Two toy robots, one of mass m1 = 4 kg with velocity u1 = 2 kg with velocity 1ms1, and another of mass m2 %3D u2 = -1ms, are moving towards each other along the %3D same straight line and collided with each other. The collision between them is completely inelastic. 1. What is the velocity of the centre of mass of the system before the collision? (Hint: Two toy robots constitute a system) 2. What are velocities u1cOM and u2cOM of the two robots in the centre-of-mass frame before the collision? What fraction of the initial kinetic energy in the laboratory frame is lost during the collision?

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