In 1993, Carl Fentham of Great Britain raised a full keg of beer (mass 62 kg) to a height of about 2 m 676 times in 6 h. Assuming that work was done only as the keg was going up, estimate how many such kegs of beer he would have to drink to reimburse his energy expenditure. (1 liter of beer is approximately 1 kg and provides about 1.5 MJ of energy; in your calculations, neglect the mass of the empty keg.)