200N is the answer (at least thats what I think)
First you calculate how long it will take for the object to fall the 90 meters. We'll take Earth's gravity acceleration as 9.8m/s²
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<em>Equation:</em>
x = x₀ + v₀ * (t - t₀) + 1/2 * a * (t - t₀)²
x -> Final position in meters
x₀ -> Starting position
v₀ -> Starting velocity
t -> Final time
t₀ -> Starting time
a -> Acceleration
<em>Our case:</em>
x = 0
x₀ = 90m
v₀ = 0m/s
t = ?
t₀ = 0
a = -9.8m/s² (Minus 9.8 because it's on top of a cliff (90m) and it's falling to ground level (0m), so it's substracting)
0 = 90 - 1/2 * 9.8 * (t - 0)²
0 = 90 - 4.9t²
4.9t² = 90
t² = 90/4.9
t = √(18.36) = 4.28 seconds
To calculate the speed, just multiply the seconds it takes to hit the ground by the acceleration of Earth's gravity:
4.28 * 9.8 = 42m/s
Human building a drainage system could affect the water cycle because :
C. water would be directed to a new location because of the drains
This could potentially changed the natural occurrence that usually happened within the water cycle
hope this helps
The latin name for hydra constellation is "Water snake"