Problem: A 200-lb man decides to add to his exercise routine by walking up three flights of stairs (45 ft) 20 times per day. He figures that the work required to increase his potential energy in this way will permit him to eat an extra order of French fries, at 245 Cal, without adding to his weight.Is he correct in this assumption?

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A 200-lb man decides to add to his exercise routine by walking up three flights of stairs (45 ft) 20 times per day. He figures that the work required to increase his potential energy in this way will permit him to eat an extra order of French fries, at 245 Cal, without adding to his weight.


We need to calculate the Potential Energy of the man at the given height. Potential energy is calculated as:

P.E. = m×g×h

Where:

m = mass

g = acceleration due to gravity (9.8 m/s2)

h = height


We are given the mass that is 200 lb, converting this to kg, we have:

1 kg = 2.2 lb


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Problem Details

A 200-lb man decides to add to his exercise routine by walking up three flights of stairs (45 ft) 20 times per day. He figures that the work required to increase his potential energy in this way will permit him to eat an extra order of French fries, at 245 Cal, without adding to his weight.

Is he correct in this assumption?

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What scientific concept do you need to know in order to solve this problem?

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