# Horizontal Acceleration of a Stone

## 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

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lewando
Homework Helper
Gold Member
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 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?

lewando
Homework Helper
Gold Member
Good.

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?

lewando
Homework Helper
Gold Member
That is the magnitude of acceleration due to gravity, near the surface of Earth. It is in the down direction.