Odpowiedzi

2009-12-04T11:06:12+01:00
1. t = 1.5h = 4800s
W = 90kJ = 90000J
P = W/t = 90000/4800 = 18.75W
2. m = 2kg
v = 11m/s
Ek = 1/2 * mv^2 = 1/2 * 2 * 11^2 = 1 * 121 = 121 J