200ft/sは何m/sですか？
200ft/s = 60.96m/s
60.96m/sなので61m/sと言っても差し支えありません — 誤差は0.5%以内です。
逆に200m/sは何ft/sですか？
200m/s = 656.168ft/s
計算式: m/s = ft/s × 0.3048
ft/s → m/s 前後の値
20 ft/s6.096m/s
40 ft/s12.192m/s
60 ft/s18.288m/s
80 ft/s24.384m/s
100 ft/s30.48m/s
120 ft/s36.576m/s
140 ft/s42.672m/s
160 ft/s48.768m/s
180 ft/s54.864m/s
200 ft/s60.96m/s
220 ft/s67.056m/s
240 ft/s73.152m/s
260 ft/s79.248m/s
280 ft/s85.344m/s
300 ft/s91.44m/s
320 ft/s97.536m/s
340 ft/s103.632m/s
360 ft/s109.728m/s
380 ft/s115.824m/s
400 ft/s121.92m/s