Question

what is the reading of the upper balance? if the mass of each balance is 0.5kg the mass hung by the lower balance is 1kg

Answer 1

Assuming that the balances are symmetrical and the center of mass is at the center of the balances, the reading of the upper balance would be 1 kg as well. This is because the gravitational force acting on the system is balanced and the net force acting on each balance is zero, resulting in an equal reading on both balances.