1. What is the gravitational potential energy of a 61.2 kg person standing on the roof of a 10-story building relative to (a) the tenth floor, (b) the sixth floor, (c) the first floor? (Each story is 2.50 m high.). Please solve with explanation.

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a)potential energy=mgh=61.2×9.8×
(10×2.50)=14994J
b)=61.2×9.8×(6×2.50)=8996.4J
c)=61.2×9.8×(1×2.50)=1499.4J
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POTENTIAL ENERGY= MGH 
MASS OF THE PERSON = 61.2 Kg
G=10 M/S
HEIGHT OF EACH STOREY = 2.50 M 
a) HEIGHT TILL TENTH FLOOR = 2.50 * 10 = 25 M
 P.E = MGH = 61.2 * 10 * 25 = 15300 J
b) HEIGHT TILL SIXTH FLOOR = 2.50 * 6 = 15 M
 P.E = MGH = 61.2 * 10 * 15 = 9180 J
c) HEIGHT TILL FIRST FLOOR = 2.50 * 1 = 2.50 M
 P.E = MGH= 61.2 * 10 * 2.50 = 1530 J
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