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V= 20/4
V= 5 m/s
5m/s= 5x 1/1000km/ 1/3600h= 5x 1/1000km : 1/3600h= 5x 1/1000 x 3600/1= 0,5x36= 18 km/h
s = 20m
a) v = s/t
v = 20/4 = 5m/s
b) 5m/s = 5*0,001km/ 1/3600 h = 18km/h