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v = 72 km/jam
= (72 x 1.000)/3.600 m/s
= 20 m/s
Dit : Ek
Jawab :
Ek = 1/2 mv²
= 1/2.2500 kg.(20)²
= 1/2.2500.400 J
= 2500.200 J
= 500.000 J
= 500 kJ
Mohon dikoreksi jika terdapat kesalahan.