At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81m/s^2 . A watermelon has a weight of 49.0N at the surface of the earth. In this problem, use 9.81m/s^2 for the acceleration due to gravity on earth 1.) What is its mass on the surface of Io? 2.) What is its weight on the surface of Io? working on #1, F=m*a F = m * 1.81 all we really know is (a) of Io. but we do know the force(49.0N) of earth, how would i convert that to the forces of Io?