Inside a uniform spherical shell :

(a) The gravitational field is zero.

(b) The gravitational potential is zero.

(c) The gravitational field is the same everywhere.

(d) The gravitation potential is the same everywhere.

(e) All the above.

Choose the most appropriate answer from the options given below:

A body of mass $\left(2M\right)$ splits into four masses $\{m,m,M-m,M-m\},$ which are rearranged to form a square as shown in the figure. The ratio of $\frac{M}{m}$ for which, the gravitational potential energy of the system becomes maximum is $x : 1.$ The value of $x$ is ________.

Four particles each of mass $M,$ move along a circle of radius $R$ under the action of their mutual gravitational attraction as shown in figure. The speed of each particle is :

A person whose mass is $100 \mathrm{kg}$ travels from Earth to Mars in a spaceship. Neglect all other objects in sky and take acceleration due to gravity on the
surface of the Earth and Mars as $10 \mathrm{m} {\mathrm{s}}^{-2}$ and $4 \mathrm{m} {\mathrm{s}}^{-2}$, respectively. Identify from the below figures, the curve that fits best for the weight of the passenger as a function of time.