Question

Fizyka na teraz zad w załączniku

Answer 1

Odpowiedź:

Wyjaśnienie:

t1=10min=600s

v1=45km/h=45000m /3600s =12,5m/s

t2=20min=1200s

v2=70km/h=70000m /3600s =19,4m/s

t3=15min=900s

s3=12km=12000m

Oblicz vśr

vśr =cała droga /czas

vśr =s/t

Obliczam drogi

s1=v1*t1

s1=12,5 m/s *600s

s1=7500m

s2=v2*t2

s2=19,4m/s *1200s

s2=23280m

cała droga

s=s1+s2+s3

s=7500m+23280m +12000m=42780m

cały czas

t=t1+t2+t3

t=600s+1200s+900s

t=2700s

vśr =42780m/2700s

vśr =15,8m/s