Odpowiedzi

2009-11-28T13:48:34+01:00
E = Ep + Ek
E = mv^2/2 = 200m
E = const
mv^2/2 + mg*5m = 200 m
v^2 + 50 = 200
v^2 = 300
v = 10* pierwiastek z 3 m/s