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(A, C) The gravitational field inside a spherical cavity within a spherical planet is uniform and non-zero. This is a standard result derived from the

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$A$ body of zero total mechanical energy placed in a gravitational field will escape the field.

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(A, C) The gravitational field inside a spherical cavity within a spherical planet is uniform and non-zero. This is a standard result derived from the superposition principle of gravitational fields.Regarding option $C$,the total mechanical energy $E = K + U$. If $E = 0$,then $K = -U$. Since $U$ is negative in a gravitational field,$K$ must be positive. As the body moves away from the source,$U$ increases (becomes less negative) and $K$ decreases. At infinity,$U = 0$ and $K = 0$,meaning the body has just enough energy to reach infinity,which is the definition of escape velocity. Thus,a body with zero total mechanical energy will escape the gravitational field.

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