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Test Index
JEE Mains 25-Jan-2023 Shift 2 Solved Paper
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© examsnet.com
Question : 14
Total: 90
A body of mass is taken from earth surface to the height
h
equal to twice the radius of earth
(
R
e
)
, the increase in potential energy will be : (
g
=
acceleration due to gravity on the surface of Earth)
[25-Jan-2023 Shift 2]
3
mgRe
1
3
mg
e
2
3
mgR
e
1
2
mgR
e
Validate
Solution:
U
=
−
GM
e
m
r
U
i
=
−
GM
e
m
R
e
U
f
=
−
GM
e
m
(
R
e
+
h
)
=
−
GM
e
m
R
e
+
2
R
e
−
GM
e
m
3
R
e
Increase in internal energy
∆
U
=
U
f
−
U
i
=
2
3
GM
e
m
R
e
2
3
GM
e
R
e
2
mR
e
=
2
3
mgR
e
© examsnet.com
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