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c)72 km/h=72*1000m/3600s=20m/s
d)100 km/h=100*1000m/3600s=27,(7)m/s
e)100 m/s=100*1/1000km*3600h= 360km/h
Pozdro :-)
c)72 1000/3600=20m/s
d)100 1000/3600≈27.7m/s
e)100*1/1000*3600=360km/h