1. An empty spherical weather balloon with a mass of 5 kg has a radius of 2.879 m when fully inflated with helium. It is supposed to carry a small load of instruments having a mass of 10 kg. Taking air and helium to have densities of 1.16 kg/m^3, respectively, what will be the acceleration of the balloon and load immediately after it is released? upward force :FB=ρairVg downward force: Mg=(5+10+ρHeV)g so FB-Mg=Ma i find that a>g can balloon have accerelate more than g? or I do something wrong?