t (s): 3 4 5 6 7 8 9 10 x1 (u): 8.9 17.3 33.6 65.5 127.6 248.6 484.1 942.9 x2 (u): 21.2 27.2 34.9 44.8 57.5 73.9 94.9 121.8 x3 (u): 241.0 161.5 108.3 72.6 48.6 32.6 21.9 14.7