October 2018 2 37 Report
Sebuah kereta api yg bergerak dgn kelajuan 108 km/jam direm dgn gaya pengereman tetap sehingga kereta api berhenti. jika massa kereta api 200 ton, berapakah usaha yg dilakukan oleh gaya pengereman mulai mengadakan pengereman sampai kereta api berhenti!
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