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A rocket lifts off the pad at Cape Canaveral. According to Newton's Law of Gravitation, the force of gravity on the rocket is given by F(x)=(-G M m)/(x^2) where M is the mass of the earth, m is the mass of the rocket, G is a universal constant, and x is the distance (in miles) between the rocket and the center of the earth. Take the radius of the earth to be 4000 miles, so that x ≥4000 miles. a. Find the work W done against gravity when the rocket rises 1000 miles. Express your answer in terms o