At time $t=0s,$ apple $1$ is dropped from a bridge onto a roadway beneath the bridge; somewhat later, apple $2$ is thrown down from the same height. The figure gives the vertical positions $y$ of the apples versus $t$ during the falling, until both apples have hit the roadway. The scaling is set by $t_s=1\mathrm{.}60s.$ With approximately what speed is apple $2$ thrown down?