The escape velocity for a planet is 
. A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reaches the centre of the planet, its speed will be
A
B
C
D
Zero
Text Solution
Verified by ExpertsThe correct answer is:
B
Gravitational potential at the surface of the earth
Gravitational potential at the center of earth 
By the conservation of energy 
[As 
]
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