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40 m/s= 40*3600m/h=144000 m/h=144 km/h
40*3600=4*36*1000=4(30+6)*1000=(120+24)*1000=144000
------ -------- ------- = 3,6km / h
1000 * 1h 1000
40m/s * 3,6 km/h = 144km/h
Odp. Kolejka górska jedzie 144km/h pod górkę.