Arturo O. answered • 04/11/18

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m

m

d

(Look up the mean radius of the earth in meters.)

d

G = constant of universal gravitation (Look it up in your physics book in units of Nm

_{1}= mass of the earth (Look it up in kg. It should be in your physics book.)m

_{2}= mass of the balloon = 400 kgd

_{f}= distance from balloon at 50,000 meters to the center of the earth = (50,000 meters) + radius of earth(Look up the mean radius of the earth in meters.)

d

_{i}= distance from launch point of balloon to center of the earth = radius of the earth (since launched from surface of earth)G = constant of universal gravitation (Look it up in your physics book in units of Nm

^{2}/kg^{2})Plug the numbers into the formula you were given and get the work in units of joules.