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V = √(T/u), siendo T la tensión y u la densidad lineal de masa de la cuerda
u = 1 kg / 20 m = 0,05 kg/m
V = d/t = 20 m / 0,5 s = 40 m/s
T = V² u = (40 m/s)² . 0,05 kg/m = 80 N
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