A person of mass 60 kg wants to lose 5 kg by going up and down a 10m 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 kilo calories, how many times must he go up and down to reduce his weight by 5 kg?
A person of mass 60 kg wants to lose 5 kg by going up and down a 10m 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 kilo calories, how many times must he go up and down to reduce his weight by 5 kg?
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1 Answer
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This is a short answer type question as classified in NCERT Exemplar
Height of stairs h= 10m
Energy produced by burning 1 kg of fat = 7000Kcal
Energy produced by burning 5kg of fat = 5
Energy utilised in going up and down one time
= mgh + =
=
= 9000J= 9000/4.2=3000/1.4cal
Number of times, the person has to go up and down the stairs
= = 16.3 times
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