In an elastic collision relative velocity of one mass in relative to other remains same in magnitude and opposite in direction.
Before collision,
velocity of mass 2 relative to mass 1 = -8.4 m/s - 7.5 m/s = -15.9 m/s
After collision,
velocity of mass 2 relative to mass 1 = 15.9 m/s
velcity of mass 1 = -6.7 m/s
hence, velocity of mass 2 = (15.9 - 6.7) m/s = 9.2 m/s
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