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Question

Select the correct choice(s)

A
The gravitational field inside a spherical cavity within a spherical planet must be non zero and uniform.
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B
When a body is projected horizontally at an appreciable large height above the earth, with a velocity less than orbital velocity, it will fall to the earth along a parabolic path
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C
A body of zero total mechanical energy placed in a gravitational field will escape the field
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D
Earth's satellite must be in the equatorial plane.
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Solution

The correct option is C A body of zero total mechanical energy placed in a gravitational field will escape the field
Gravitational field is a conservative field, total mechanical energy is conserved.

U+K=0
12mv2GMmr=0
v=2GMr

Here as v is equal to escape velocity,

Thus the body escapes to infinity.

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