1. The problem statement, all variables and given/known data A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground? Vi = -20 m/s height = 60 m t = ? 2. Relevant equations d = Vi.t + 1/2 a t2 3. The attempt at a solution Couldn't figure out. How to use height as a distance?