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i) Mass 1 is initially moving in the +x direction and has 20 Joules of kinetic...

i) Mass 1 is initially moving in the +x direction and has 20 Joules of kinetic energy. It collides perfectly elastically with mass 2 moving at in the -x direction with 14 Joules of kinetic energy. After the collision, mass 2 has 20 Joules of kinetic energy. How much kinetic energy does mass 1 have after the collision in Joules? (Note: the masses are not needed to answer this question.)
ii) Mass 1 of 10 kg is initially moving at 6 m/s in the +x direction and it collides perfectly elastically with mass 2 of 3 kg initially at rest. What is the final velocity of mass 2 after the collision in m/s? (Note: the masses are not needed to answer this question.)

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