A hollow spherical planet is inhabited by people who live inside it, where the gravitational is zero. When a very massive space ship lands on the planet's surface, the gravitational field inside the planet is:.
a) nonzero, directed away from the spaceship
b) still zero
c) nonzero, directed toward the spaceship

c) nonzero, directed toward the spaceship

Explanation:

As we know that net gravitational force due to spherical shell inside all its points will always be zero

So if planet is a spherical shell then inside the planet net gravitational force is zero on the people living in it

So when massive spaceship land on the surface of planet then the gravitational force of the spaceship is experienced by the people inside the shell

So here the gravitational force on the people is nonzero and it is towards the spaceship which landed on the surface of planet

this is poiselle's equation from fluid mechanic in physics. mech eng

reserve is the answer