A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 40kg barbell straight up at a distance of .50m.
a. how much work does the weightlifter do to lift the barbell one time?
b. if the weightlifter does 20 reps a day what total energy does she expend on lifting? assume 25% efficency.
c. How many 400 calorie donuts can she eat a day to supply that energy.
The Attempt at a Solution