2. A diver, of mass 57.8 kg, climbs up a diving-board ladder and then walks to the edge of the board. He then steps off the board and falls vertically from rest to the water 3.00 m below. Determine the diver's gravitational potential energy at the edge of the diving board, relative to the water.A child rolls a superhall of mass DIES kg along a table at a speed of 2.3 ms to collide head-on with a smaller stationary superhall of mass [102 kg. The collision is elastic. Determine the velocity of each hall after the collision. Determine the mass of Earth using the magnitude of the gravitational eld strength at the surface of the Earth. the distance r between Earth's surface and its centre {5.33 x lm} and the universal gravitation constant