An experiment is carried out in a place where the vertical direction of the acceleration due to gravity, (g=10 m/s2) changes every 5 s. With gravity oriented downwards, a sphere is dropped from y=8 m. What is the position y (in m) of the sphere 9 s after the start of its motion?


a) -125 m
b) -117 m
c) -167 m
d) -317 m
e) -237 m