A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 44kg barbell straight up from chest height to full arm extension, a distance of 0.50m. (A) How much work does the weightlifter do to lift the barbell one time? (B) If the weightlifter does 25 repetitions a day, what total energy does she expend on lifting? Assume 25% efficiency. (C) How many 490 Calorie donuts can she eat a day to supply that energy?