1. The problem statement, all variables and given/known data 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? 2. Relevant equations a = Δv/Δt = (vfinal - vinitial) / (tfinal - tinitial) 3. The attempt at a solution ??? I don't know where to start!! Please help!