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Ec = 400 Julios
v = 10 m/s
masa = ?
calculamos con la formula
Ec = 1/2 m * v2 despejamos
m = 2Ec / v2
m = 2·400 Kg·m2/s2 / (10 m/s)2
m = 800 kg·m2/s2 / 100 m2/s2
m = 8 kg ------> solucion
saludos desde venezuela