Answer:
the height of the cliff is equal to 108.241 m
Step-by-step explanation:
given,
initial speed of the stone horizontally = 9 m/s
vertical speed of the stone = 0 m/s
time taken of the trajectory = 4.7 s
using equation of motion




s = 108.241 m
hence, the height of the cliff is equal to 108.241 m