The figure below illustrates the gravitational potential energy of two rocks at two different heights above the ground which has been designated to be where the gravitational potential energy is zero (i.e. h = 0 on the ground). There is a sometimes useful Gravitational Potential Energy quantity known as the gravitational potential, defined as gravitational potential energy per unit mass. Calculate the gravitational potential 2 kg, 2m for each rock at each height and 1 kg, 2m comment why this might be a -20 J of PE -DJ of PE useful quantity. ( 2 ) (1 ) ( 9.8 ) ( 2) ( 2 ) ( 9 . B) 20 / kg E = mgh = 20/ 1K9 = 204/ kg = 39 212kg 1 ke, 1m 2kg, 1m 10 J of PE - 20 J of PE PE = potential ( 1 ) ( 1 ) (9.8 ) (2 ) CI ) ( 9 8 ) m = 9.3/1 kg = 10 / kg 19. 4/ 2kg This Is useful because it can REPS= 104/Kg be seen that the gravitational Is dependent on the neight of the object instead of its mass The diagram below represents a pair of charged conductors (with positive and negative charge indicated) similar to one set of those that will be used in Activity 2. What do you expect the Electric field lines and lines of equal potential to look like? Sketch in your prediction for the E field with a solid line and use a dashed line to predict lines with equal potential. +