If a bouncing ball has a total energy of 20 j and a kinetic energy of 5 j, the ball’s potential energy isj. if the kinetic energy of the ball decreases, then the potential energy will

The sum of the energies of the body is always equal to the total energy, according to the law of conservation of energy.

Etotal= KE+PE
PE= Etotal-KE= 20-5= 15J

To keep this total energy constant, when kinetic energy if the ball decreases, the potential energy increases, and vise versa.

Hope this helps.