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b)5cm/s=(5*0,01m)/s=0,05m/s
c)120km/h=(120*1000m)/3600s=33,(3)m/s
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2.
15km/h=(15*1000m)/3600s=4,1(6) m/s < 5 m/s
Odp.:Motocyklista porusza się szybciej niż rowerzysta.