Odpowiedzi

2009-05-27T18:32:43+02:00
F= m*g
F= 60kg* 10
F= 600N

W= F*s
W= 600*3= 1800J
2009-05-27T18:33:22+02:00
Praca to iloczyn sily i drogi
W=Q*s

Sila to ciezar Q=mg

S=3*3=9m

W=60*9,81*9 [J]=5297.4[J]=5,3[kJ]