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= 1/2. m (v2²- v1²)
= 1/2. 1000 (-36)
= 18000 kJ
=1/2× 1000×(36-72)pangkat 2
= 500×(-36) pangkat 2
=500×1296
Ek = 648000 joule=648000÷1000= 648 kj