If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of kinetic/ potential energy?

Choose the correct alternatives :

The energy required to rocket an orbiting satellite out of earth's gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth's influence.

Justify : the formula $-GMm\left(\frac{1}{r_2}-\frac{1}{r_1}\right)$ is more accurate than the formula $mg\left(r_2-r_1\right)$ for the difference of potential energy between two points $r_2$ and $r_1$ from the centre of the earth.

Which of the following observations point to the equivalence of inertial and gravitational masses ?

Two spheres of different masses dropped from the top of a long evacuated tube reach the bottom of the tube at the same time.

Which of the following observations point to the equivalence of inertial and gravitational masses ?

Time period of a simple pendulum is independent of its mass.

Which of the following observations point to the equivalence of inertial and gravitational masses?

The gravitational force on a particle inside a hollow isolated sphere is zero.

Which of the following observations point to the equivalence of inertial and gravitational masses?

For a man in a closed cabin that is falling freely under gravity, gravity 'disappears'.

Which of the following observations point to the equivalence of inertial and gravitational masses ?

An astronaut inside a spaceship orbiting the earth feels weightless.