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Lösning 3.1:5

FörberedandeFysik

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a) Eftersom acceleration är

a=tidsintervallhastighetsändring=tv får vi

a=tv=120s17ms=0142ms2


b) v0=75kmh=208ms

v2=v02+2asv2=(208ms2)2(0142ms2)(160m)=387(ms)2
v=197ms

c)v=v0+at197ms=208ms(0142ms2)tt78s