Respuesta:
EC = mv^2 / 2
1000J = m (20m/s)^2 /2
2000J = 4O0m/s . m
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Respuesta:
EC = mv^2 / 2
1000J = m (20m/s)^2 /2
2000J = 4O0m/s . m
m= 5 kg