Horizontal Acceleration of a Stone

AI Thread Summary
The stone thrown horizontally from a 25 m high cliff lands 22 m away, prompting a discussion on its horizontal acceleration. It is established that once the stone is in motion, there are no horizontal forces acting on it, leading to a horizontal acceleration of 0 m/s². The only force acting on the stone vertically is gravity, which accelerates it downward at 9.8 m/s². Participants confirm that the vertical acceleration is indeed 9.8 m/s², directed downward. The conversation emphasizes the distinction between horizontal and vertical forces in projectile motion.
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Homework Statement



A stone is thrown horizontally from a cliff 25 m high and lands on the ground 22 m from the foot of the cliff. What is the horizontal acceleration on the stone?


Homework Equations



a = Δv/Δt = (vfinal - vinitial) / (tfinal - tinitial)


The Attempt at a Solution



? I don't know where to start! Please help!
 
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The key word is "horizontal" acceleration [okay, two words]. Once the stone is tossed, what forces are acting on it? What vertical forces? What horizontal forces?
 
lewando said:
The key word is "horizontal" acceleration [okay, two words]. Once the stone is tossed, what forces are acting on it? What vertical forces? What horizontal forces?

The vertical forces are gravity which has a velocity of 9.8 m/s.
I don't think there are any horizontal forces (if you exclude wind resistance).

So is the horizontal acceleration 0 m/s2?
 
Good.
 
lewando said:
Good.

Thank you for helping me.
How would you recommend finding the vertical acceleration of a problem like this?

Would it just be 9.8 m/s2?
 
That is the magnitude of acceleration due to gravity, near the surface of Earth. It is in the down direction.
 

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