At time $t=0$, apple 1 is dropped from a bridge onto a roadway beneath the bridge; somewhat later, apple 2 is thrown down from the same height. Figure $2-30$ 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 $t_{s}=2.0 \mathrm{~s}$. With approximately what speed is apple 2 thrown down?