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m = 5 ton = 5000 kg
v = 72 km/jam = 20 m/s
Ditanyakan:
Ek = ?
Jawab:
Ek = 1/2 m v²
Ek = 1/2 (5000) 20²
Ek = 2500 x 400
Ek = 1000000 J = 1000kJ