The Great Pyramid of Giza has a total mass of 6.50 x 109 kg, a height of 147 m, and the centre of mass is 36.7 m above the ground. How much gravitational potential energy is stored in the Great Pyramid of Giza? A A pendulum is displaced through an arc so that it is 6.85 cm above its lowest position and then released. What is the speed of the pendulum as it passes through its lowest point? Assume there is no air resistance