Answer:
2. the force of the stone's gravity polling up on the Earth
Explanation:
As we apply the force on the stone, the acting gravity on the stone resists as a reaction force. But that also depends upon the angle of force applied. There will be less force required on the horizontal component than vertical relative to gravity. But the force of friction aided by gravity always resists as a reaction force.
This is an example of classical conditioning, and the library is a conditioned stimulus.
The idea of classical conditioning was first put forward by the man Ivan Pavlov, a Russian physiologist.
In his studies, he was able to successfully associate a once neutral stimulus to a conditioned response. The neutral stimulus hitherto does not produce the expected response until after conditioning has taken place.
In this case, the library was a neutral stimulus. When it becomes associated with a bakery, it provokes the conditioned response of hunger any time you go to the library.
The library is now a conditioned stimulus.
Learn more: brainly.com/question/18080270
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
Answer:
Did you ever get the answer?
Explanation:
Not completely understanding what the question is