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1200s=tetap 1200 sekon
18km/jam=18x1000/3600=5m/s
1 jam = 3600 sekon
40m/s= 0,44km x 3600 jam= 144km/jam
20m/s^=0,02kmx3600x100 karena pangkat 2= 7200km/jam^
2gr/cmpangkt3= 0,002x 1000000= 2000kg/cm pngkt3