1.
m = 12 kg
h = 20 m
v = 36 m/s
Ep = 12kg x 10 m/s^2 x 20 m = 2400J
Ek = mv^2/2
Ek = 12kg x (36 m/s) ^2 /2 = 6 x 1296 = 7776J
E = 10176 J = 10,176 kJ
Energia calkowita(mechaniczna) bociana wynosi 10,176 kJ.
2.
V = 20 m/s
Ek = 2000J
E = mv^2 /2
2E = mv^2
m = 2E/v^2
m = 4000 / 400 = 10 kg
Cialo to mialo mase 10 kg.