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2. Massa(kg) 5 kecepatan(m/s) 20 energi (j) 1000
EK=1/2mv²
EK=1/2 5kg x (20m/s)²
EK=1/2X 2000 kg²m²/s²
EK=1000j
3. Massa(kg) 5 kecepatan(m/s) 10 energi(j) 250
EK=1/2mv²
EK=1/2 5kg x (10m/s)²
EK=1/2X 500 kg²m²/s²
EK=250j