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Ek = 139 KJ = 139.000 J
v = 60 km/jam = 16,67 m/s
Dit : m
Jawab :
Ek = 1/2 . m . v²
139.000 = 1/2 . m . 16,67²
139.000 . 2 = 277,89 m
278.000 = 278 m
m = 278.000 / 278
m = 1000 kg
Ek = 139 kJ = 139.000 J
Dit = massa (m)
Peny =
Ek = 1/2 x m x v kuadrat
139.000 = 1/2 x m x 60 kuadrat
139.000 = 1.800 x m
m = 139.000 : 1.800
m = 77.2 kg
*maaf kalau salah