> Physics uncertainty problem?

Physics uncertainty problem?

Posted at: 2014-06-09 
Carl is calculating the potential energy of a ball. The height is measured to be 1.5 + 0.007 m and the mass to be 0.6 + 0.005 kg. What should he report the uncertainty be reported as? Include units I made uncertainty equation as = sqrt((0.007/1.5)^2+(0.005/0.6)^2) Am I wrong with this equation?? help me plz ..