36 \frac{km}{godz} = 36 * \frac{1000 m}{3600 s} = \frac{360m}{36s} = 10m/s
s = v * t
Dane:
v=10m/s
t=10s
s=?
s = 10\frac{m}{s} * 10s (s skracają się)
s = 100 m
---------------
ZAD.2.
innym sposobem:
72000m-------3600s
x[m]----------20 s
---------------------------z proporcji:
3600s * x = 72000m * 20s
x = \frac{72000m * 20s}{3600s}
x = 400 m