a) [10 pt] A weightlifter curls a 100 kg bar, raising it each time a distance of 0.61 m. How many times must he repeat this exercise to burn off all the energy in one energy bar that contains 22 g of carbohydrates? You can assume 25% efficiency and use g - 9.8 m/s2. [Watch out: need to burn off ALL energy!] [Answer in whole integer] TABLE 11.1 Energy in fuels Energy in 1 g of fuel Fuel (in k.J) Hydrogen 121 Gasoline 44 Fat (in food) 38 Coal 27 Carbohydrates 17 (in food) Wood chips 15