1. The problem statement, all variables and given/known data A ball is dropped from the roof of a building. An observer looking outside the window sees the ball just outside. If the window is 3.99 m tall and the ball is in view for 0.897 s, how far below the roof is the bottom of the window? 2. Relevant equations "Kinematics Equations average velocity: vave=Δx/Δt average acceleration: aave=Δv/Δt Uniform Acceleration: vave=(vi+vf)/2 Three key variables (displacement, time, velocity) lead to three key relationships relating each pair: velocity & time: v=v0+at displacement & time: x=x0+v0t+(1/2)at2 velocity & displacement: v2=v20+2aΔx" source : Physicsforums.com 3. The attempt at a solution I do not know how to even start this question from.. For example, what equations to use or what numbers do I need to get in order to solve this question. Please help me with this one guys, thank you very much!