A person of mass 60 kg wants to lose 5 kg by going up and down a 10 m high stairs. Assume he burns twice as much fat while going up than coming down. If 1 kg of fat is burnt on expending 7000 kilocalories, how many times must he go up and down to reduce his weight by 5 kg?
Energy used to go up =mgh=60×10×10=6000J Energy used to come down 26000=3000J Energy used in one round trip =9000J 1cal=4.5J 1J=4.2cal1 9000J=4.29000=2142.85cal 7000kilocal is required to burn 1kg mass To reduce 5kg mass, energy required =7000×5=35000kiloval Number of trip =2142.8535000×1000=1.7×103
