Basic question regarding gravitation

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a 120kg person stands on the surface of an asteroid of radius 600m. the person leaves the surface with 15J of kinetic energy and reached a maximum height of 300m above the asteroid's surface. what is the mass of the asteroid.

i am stuck please help me with the problem.

15-GMm/r(i) = 0 - GMm/r(f)

plug in and solve for an unknown mass?
 
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