In: Physics
4) Mass 1 is initially moving at 3 m/s in the +x direction and it collides perfectly elastically with mass 2 moving at 10 m/s in the -x direction. After the collision, mass 1 is moving at 5 m/s in the +x direction. What is the final velocity of mass 2 in m/s? If in the negative x direction, include a negative sign. (Note: the masses are not needed to answer this question.)