Escape velocity of a satellite of the Earth at an altitude equal to radius of the Earth is $V$. What will be the escape velocity at an altitude equal to $7R$, where $R=$ radius of the Earth?

A missile is launched with a velocity less than the escape velocity. The sum of kinetic energy and potential energy is :

A body is projected horizontal on the top of the Mount Everest with speed much greater than $\sqrt{2gr},$ where $r$ is the distance of the projection point from the centre of the earth and $g$ is the acceleration due to gravity there. The trajectory of the body will be a