An illustration depicts a ball at a position labeled B and a height from the sea level of 0.25 meters rolls down through an inclined plane to a point labeled A at the sea level. A stone weighing 0.7 kilograms rolls down the inclined plane from position B to position A. Position A is located at sea level. The difference in the gravitational potential energy of the ball between positions A and B is about ____ joules. (Use PE = m × g × h, where g = 9.8 N/kg.)