Problem Statement:The force $($lbf$)$ exerted by the jet on the wall can be determined using the following equation:F$=$AV$2$where F$=$Force $($lbf$),=$density $($lbm$/$ft$3),$ V$=$velocity $($ft$/$s$),$ and A$=$area $($ft$2)$water$=62\mathrm{.}4$lbmft$3$gc$=32\mathrm{.}2$lbmftlbfs$21$ft$=12$in