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m= 5 ton --> 5×1000= 5000 kg
v= 72 km/jam --> 72×1000/3600= 20 m/s
Dit:
Ek=..?
Penye:
Ek= 1/2.m.v²
Ek= 1/2×5000×20²
Ek= 2500×400
Ek= 1000000 Joule atau 1000 KJ atau 1MJ