A 75-kg trampoline artist jumps vertically upward from the top of a platform with a speed of 3.0 m/s. How fast is she going as she lands on the trampoline, 2.5 m below?
a) 7.5 m/s
b) 9.8 m/s
c) 11.2 m/s
d) 12.5 m/s