What is the escape velocity of the object, if.the magnitude of the potential energy per unit mass of the object at the surface of earth is `E`?

Explanation

Magnitude of the potential energy per unit mass of the object at the surface of Earth is the magnitude of the gravitational potential at the
surface of the Earth is `= (GM)/(R ) = E` (given)
Escape velocity, `upsilon = sqrt((2GM)/(R )) = sqrt(2E)`