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v= 72 km/jam = 20 m/s
Ek= 30000 Joule
Dit:
m=..?
Penye:
Ek= 1/2.m.v²
1/2.m.v²= Ek
1/2×m×20²= 30000
1/2×m×400= 30000
200×m= 30000
m= 30000/200
m= 150 kg.