Respuesta :

Potential Energy = Mass x Gravitational Constant x height = mgh

6 = m(9.81)(3) 

Divide both sides by 9.81 and 3 to get m alone.

6 / (9.81 x 3) = 0.204 

Also, don't forget units! I'm not sure what your units are for the mass because you didn't give units for Potential Energy.
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