Gughanath
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When a stone is thrown over a clift, there is vertically acceleration, I don't understand why there is no horizintal acceleration? 

As soon as you let go of the stone, it will no longer have horizontal acceleration. This is due to Newton's 2nd law of motion, most videly known as F=ma. If there are no forces acting on the object, it will not accelerate. It's called inertia, and works independantly for each axis of any coordinate system.Clausius2 said:But if you push it horizontally probably it will have horizontal acceleration.
alpha_wolf said:As soon as you let go of the stone, it will no longer have horizontal acceleration. This is due to Newton's 2nd law of motion, most videly known as F=ma..