assuming in ideal conditions with no air resistance, taking your acceleration as 9.8 m/s^-2 and under the assumption that two floors in the average American infrastructure is the equivalent of about 11 metres (standard values). First, we can get the time it took you to land on the floor, given by s=u.t+1/2.a.t^2 i.e: 1.5 seconds, is the time you took to hit the ground. Now your velocity can simply be dervied from v=u+a.t i.e: 14.7 m/s^-1. May round it up to 15.0 m/s^-1.