NCERT Exercise 5.22 - Work, Energy and Power
Question: A dieter lifts 10 kg through 0.5 m one thousand times. If food-to-mechanical efficiency is 20%, find work and fat used, with 3.8 x 10^7 J/kg from fat.
Answer: Work = **4.9 x 10^4 J**; fat used = **about 6.5 g**.
Full step-by-step NCERT solution with diagrams on Something by Zero.