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v=72km/jam=20m/s
Ek=1/2mv"
=1/2x5000x20"
=10.000.000 J
=10MJ (mega joule)
satuan km/jam diganti m/s = 72000/3600 = 20m/s
dengan m =massa dalam kg
v = kecepatan dalam satuan m/s
Ek = 1.000.000J
Ek = 1.000 KJ