The percent of this energy that will be used up if he climbs 100-meter stairs is 1 %.
Potential energy = mgh
where
m = mass
g = acceleration due to gravity
h = height = 100 m
Therefore,
weight = mg = 418.6 N
Potential energy = 418.6 × 100 = 41860 joules
covert 100 calories to joules.
1 calories = 4.184 j
100 calories = 418.4 joules
% energy used up = 418.4 / 41860 × 100
% energy used up = 41840 / 41860 = 0.99952221691
% energy used up ≈ 1 %
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