Odpowiedź:
Wyjaśnienie:
v=s/t
v1=s1/t1=120 m/80s=1,5 m/s
v2=s2/t2=0 m/40s=0 m/s
v3=s3/t3=80m/20s=4 m/s
v4=s4/t4=0m/20s=0 m/s
a1=Δv1/Δt1=1,5 m/s/80 s=0,018 m/s˄2
a2=Δv2/Δt2=0 m/s˄2
a3=Δv3/Δt3=4 m/s20s=0,2 m/s˄2
a4=Δv4/Δt4=0 m/s˄2
DRUGA CZĘŚĆ
a) a1=Δv1/Δt1=120 m/s/30 s=4 m/s˄2
a2=Δv2/Δt2=0 m/s˄2
a3=Δv3/Δt3=80 m/s/20 s=4 m/s˄2
a4=Δv4/Δt4=0 m/s˄2
a5=Δv5/Δt5=-200 m/s/40 s=-5 m/s˄2 opóźnienie
b) s1= a1t1˄2/2=4 m/s˄2*900 s/2= 1800 m=1,8 km
s2= a2t2˄2/2=0 m/s˄2*400 s/2= 0 m
s3= a3t3˄2/2=4 m/s˄2*400 s/2= 800 m
s4= a4t4˄2/2=0 m/s˄2*900 s/2= 0 m
s5= a5t5˄2/2=5 m/s˄2*1600 s/2= 4000 m= 4 km
S całk.= S1+S2+S3+S4+S5=1800+0+800+0+4000m= 6400 m= 6,4 km
