Odpowiedź:
a) dane :t
1 = h, 1 t
2 = h, 1 v1 = 30 km/h, v2 = 10 km/h
h
km 20
h 2
30 km 10 km
1 2
1 2
. =
+
=
+
+
=
t t
s s
vśr
b) dane :s1 = 20 km,s2 = 20 km, v1 = 30 km/h, v2 = 10 km/h
h
km 15
h
3
8
40 km
h
km 10
20 km
h
km 30
20 km
20 km 20 km
2
2
1
1
1 2
1 2
1 2
. = =
+
+
=
+
+
=
+
+
=
v
s
v
s
s s
t t
s s
vśr
c) dane :t
1 = h, 1 s2 = 20 km, v1 = 30 km/h, v2 = 10 km/h
h
km
3
2
16
h 3
50 km
h
km 10
20 km
h 1
30 km 20 km
2
2
1
1 2
1 2
1 2
. = =
+
+
=
+
+
=
+
+
=
v
s
t
s s
t t
s s
v
Wyjaśnienie: