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UPSC NDA I 2016 General Ability Solved Paper
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© examsnet.com
Question : 63
Total: 150
A body has a free fall from a height of 20 m. After falling through a distance of 5 m, the body would
[NDA I 2016]
lose one-fourth of its total energy
lose one-fourth of its potential energy
gain one-fourth of its potential energy
gain three-fourth of its total energy
Validate
Solution:
According to law of conservation of energy total energy remains conserved.
P
.
E
.
=
m
g
h
=
20
m
g
Loss in potential energy is observed, as
(
P
.
E
.
)
1
=
m
g
h
=
5
m
g
(
P
E
)
1
(
P
.
E
)
=
5
m
g
/
20
m
g
=
1
4
(
P
.
E
)
1
=
1
4
P
.
E
© examsnet.com
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