Answer:
Explanation:
Find the time it takes for the object to hit the ground from 20 m and use this time X horizontal velocity to find the answer .....
Time to hit ground : d = 1/2 a t^2
20 = 1/2 ( 9.81) t^2 t = 2.019 s
Horizontal distance from cliff 2.019 s x 40 m/s = 80.8 m from foot of cliff