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NEET Exam Model Paper 7
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© examsnet.com
Question : 19
Total: 180
The change in potential energy when a body of mass m is raised to a height nR from Earth’s surface is (R = radius of the earth,g=acceleration due to gravity on surface of Earth)
m
g
R
n
(
n
−
1
)
mgR
m
g
R
n
(
n
+
1
)
m
g
R
n
2
(
n
2
+
1
)
Validate
Solution:
Change in PE,
∆
U
=
U
2
−
U
1
=
−
G
M
m
(
R
+
n
R
)
+
G
M
m
R
=
−
G
M
m
R
(
n
+
1
)
+
G
M
m
R
=
(
R
2
g
)
m
g
×
n
(
n
+
1
)
=
m
g
R
n
n
+
1
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