which change to the integumentary system is to be expected with aging increase number of subcutaneous glands, thin fragile nails, pallor, decreased blood flow to the dermis

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.