GravitationHard
Question
The escape velocity for a planet is ve. A tunnel is dug along the diameter of the planet and a small body is dropped into it from the surface. when the body reaches the centre of the planet, its speed will be-
Options
A.Ve
B.
C.√2 Ve
D.
Solution
Apply energy conser vation
T.E. at centre = T.E. at surface
mv2 - 
mv2 = 
or v =
T.E. at centre = T.E. at surface
mv2 - mv2 = or v =
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