1. The problem statement, all variables and given/known data Object dropped from a tower at height of 71.3 metres What is the time it takes to hit the ground? What is the velocity when it does? gravitational acceleration = 9.8m/s2 2. Relevant equations V = ΔX/Δt X = average velocity X time 3. The attempt at a solution I don't know a formula that would enable me to get the time.