Ec = (MV^2)/2
Ec = 270
V = 3s
270 = [M * (3)^2]/2
540 = 9M
M = 60
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Ec = (MV^2)/2
Ec = 270
V = 3s
270 = [M * (3)^2]/2
540 = 9M
M = 60
*En=mv²/2
Resolvendo.
En=mv²/2
270=m.3²/2
270x2=m.9
540=m.9
540/9=m
60=m
R=Portanto a massa será de 60 kg...