Explanation
Mass of the hail always remain constant. It does not depend upon the acceleration due to gravity.
Intensity inside a shell is zero
Escape velocity does not depend on the mass of the projectile.
If missile is launched with escape velocity, then it will escape from the gravitational field and at infinity its total energy becomes zero.
But if the velocity of projection is less than escape velocity then sum of energies will be negative. This shows that attractive force is working on the missile.
Escape velocity does not depends upon the angle of projection.
Telecommunication satellites are geostatinary satellites.
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