Odpowiedź:
11.
Dane:
vp= 2m/s
t1= 3s
a= 1m/s2
t2= 3s
Szukane:
vk=?
vk= a*t+ vp
Vk= 1m/s2* 3s+ 2m/s
Vk= 5m/s
I etap: V=2m/s
II etap: V=5m/s
12.
a) na I i III
b) 8 sekund
c)
s1= 4s* 15m/s= 60m
s2= ((vp+vk)*t):2=( (15m/s+ 25m/s)*2 ):2= 40m
s=100m
d)
I:
Vp=0m/s
vk=15m/s
t= 6s
a= 15m/s:6s= 2,5m/s2
III:
Vp=15m/s
Vk=25m/s
t=2s
a= (25m/s-15m/s):2s= 5m/s2
III>I