Horizontal Acceleration of a Stone

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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!
 

Answers and Replies

  • #2
lewando
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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?
 
  • #3
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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?
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?
 
  • #4
lewando
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Good.
 
  • #5
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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?
 
  • #6
lewando
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That is the magnitude of acceleration due to gravity, near the surface of Earth. It is in the down direction.
 

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