The total energy of the fruit remains unchanged, it only changes from one form to another (potential to kinetic and vice versa). Energy loses only when they connects to each other. When fruits bounce less, game becomes easier (not so "bullet hell").
If you drop fruit on another, and first one jumps away, second fruit, that you will drop on that one in the jar wouldn't launch this up like the first one. In one hand, you have less fruits, but on other-less energy to bounce. Launch second fruit away like this is one of my first moves to play longer.