Răspuns :
L mec o ridicare = W = mgh = 200*9.8*0.75 = 1470 j
L mec total = 120 * L mec o ridic=120*1470 = 176400 j
P = Lmec total /timp = 176400/60 = 2940 w
L mec total = 120 * L mec o ridic=120*1470 = 176400 j
P = Lmec total /timp = 176400/60 = 2940 w