mathematica编程哪里错啦,急~~NDSolve[{y''[t] == -9.81, y[0] == 11, y'[0] == 0, x[t] = 1.5 t, WhenEvent[y[t] == 0, y'[t] -> -0.80 y'[t]], WhenEvent[y[t] == 0, x'[t] -> -0.80 x'[t]], WhenEvent[ Abs[y'[t]] < 1*10^(-6), {tf = Sqrt[x^2 +

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