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1.
The escape velocity of a sphere of mass 
from earth having mass 
and radius 
is given by
from earth having mass and radius is given by
2.
Gravitational potential on the surface of earth is (
mass of the earth, 
radius of earth)
mass of the earth, radius of earth)
3.
If orbital velocity of planet is given by 
, then
, then
4.
If both the masses and radius o the earth, each decreases by 50%, the acceleration due to gravity would
5.
A spherical planet for out in space has a mass 
and diameter 
. A particle of mass falling freely new the surface of this planet will experience an acceleration due to gravity which is equal to
and diameter . A particle of mass falling freely new the surface of this planet will experience an acceleration due to gravity which is equal to