dane:
Ep=15J
h=3m
v1=10m/s
g=10m/s^2
szukane:
Ek1=?
Ek2=?
m=?
v2=?
Ep = m * g * h
m = Ep / (h * g)
m = 15J / (3m * 10m/s^2) = 0,5kg
Ek = v ^ 2 * m / 2
Ek1 = (10m/s)^2 * 0,5kg / 2 = 25J
Ek2 = Ek1 - Ep
Ek2 = 25J - 15J = 10J
v2^2 = 2Ek2 / m
v2^2 = 20J / 0,5kg
[tex]v_{2} =\sqrt{10} m/s=3,2m/s[/tex]
