A block slides down an incline. As it moves from point A to point B, which are 5.0 m apart, an external force F acts on the block, with magnitude 2.0 N and directed down along the incline. The magnitude of the kinetic frictional force acting on the block is 10 N. If the kinetic energy of the block increases by 35 J from A to B, what is the change of the gravitational potential energy as the block moves from A to B?