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a)20 m/s=20×(1/1000)/(1/3600)km/h=72 km/h
b)144 m/s=144×(1/1000)/(1/3600)km/h=86,4km/h
c)1.3 m/s=1,3×(1/1000)/(1/3600)km/h=4,68 km/h
ZAD.2
a)129,6 km/h=129,6×(1000/3600)m/s=36m/s
b)104.4 km/h=104,4×(1000/3600)m/s=29m/s
c)108 km/h=108×(1000/3600)m/s=30m/s
to co w nawiasach to są ułamki (zrobiłam tak, żebyś się połapała o co chodzi ;p)