Odpowiedzi

2009-12-20T19:33:39+01:00
M = 100 kg
h = h1 - h2 = 12 - 2 = 10 m
W = ΔEp = m * g * h = 100 * 10 * 10 = 10 000 J = 10 kJ
2009-12-20T19:35:56+01:00
M = 100kg
h1 = 12m
h2 = 2m

W=ΔEp

Ep1 = mgh1
Ep1 = 100kg*10m/s2*12m = 12000J

Ep2= mgh2
Ep2 = 100kg*10m/s2*2m = 2000J

ΔEp = 12000 - 2000 = 10000J