The potential energy of a long spring stretched by 2cm is U. If the spring is stretched by ten centimetres, its potential energy increases by ten percent (in terms of U). Work is done against the gravitational force of attraction while moving a body against gravity. It signifies that the system’s potential energy grows in all three instances. However, as the bubble rises in the direction of the upthrust force, the system functions, and the system’s potential energy diminishes.