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Given initial velocities of two particles, what are their velocities after they collide?

Two particles, of mass 1 kg and 3 kg, are traveling towards each other with velocities of 100 m/s and -40 m/s respectively. Using the laws of physics (e.g. conservation of energy & momentum) calculate the following:
a) What are the initial energies of the particles?
b) What are the final velocities of the particles?
c) Which particle gained energy, and which lost energy?

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