Odpowiedzi

2009-11-04T19:51:45+01:00
W = Ek

W = mv²/2

W = 800*20²/2 = 160000J = 160kJ
2009-11-04T19:58:12+01:00
M=800 kg
V=72km/h = 200m/s

W=800*200
W=160000J